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This cover from United Nations (New York Office) depicts 4 stamps (2 of each type), celebrating 2 UNESCO World Heritage Sites in Spain: the Alhambra, Generalife and Albazín in Granada and the Archaeological Ensemble of Mérida. The three sites in the town of Granad are remnants of the Moorish influence in southern Spain. The fortress Alhambra and the palace Generalife were built by the rulers of the Emirate of Granada are are part of the World Heritage List since 1984. The Albayzín district contains examples of the Moorish vernacular architecture and was added to the listing in 1994. Augusta Emerita, also called Emerita Augusta, was a Roman colonia founded in 25 BC in present day Mérida, Spain. The city was founded by Roman Emperor Augustus to resettle Emeriti soldiers from the veteran legions of the Cantabrian Wars. The theater and amphitheater are visible to the right, along the city wall. Today the Archaeological Ensemble of Mérida is one of the largest and most extensive archaeological sites in Spain and a UNESCO World Heritage Site since 1993.

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This cover from United Nations (New York Office) depicts 4 stamps (2 of each type), celebrating 2 Natural UNESCO World Heritage Sites in Australia: the Uluru-Kata Tjuta National Park and the Wet Tropics of Queensland. The Uluru-Kata Tjuta National Parkhis is inscribed at UNESCO World Heritage List since 1987 and was chosen as an example of a landscape that is culturally sacred to Aboriginal people. The park's two massive sandstone formations, Uluṟu and Kata Tjuṯa, are spiritually important to many Aṉangu. They form part of the local tjukurpa belief system. Cave paintings found at Uluṟu date back tens of thousands of years. The Wet Tropics of Queensland is a UNESCO World Heritage Site since 1988 which has the oldest continuously surviving tropical rainforests on Earth. The forests date from the Mesozoic era when the climate of Australia (and the world) was much more tropical than today. Originally, the rain forest area covered a much wider area than today. Today it is just a narrow strip along the east coast of Queensland.

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This cover from United Nations (New York Office) depicts 4 stamps (2 of eavch type), celebrating 2 UNESCO World Heritage Sites in Spain: the Old Town of Segovia and its Aqueduct and the Works of Antonio Gaudí in Barcelona. Segovia a city in the autonomous community of Castile and León, Spain. Segovia is in the Inner Plateau (Meseta central), near the northern slopes of the Sistema Central range and on a bend of the Eresma river. The city is famous for its historic buildings including three main landmarks: its midtown Roman aqueduct, its cathedral (one of the last ones to be built in Europe following a Gothic style), and the medieval castle, which served as one of the templates for Walt Disney's Cinderella Castle. The city center was declared of World Heritage by UNESCO in 1985. The Roman aqueduct was constructed in the 1st century, the medieval Alcázar palace in the 11th century, and the cathedral in the 16th. Antoni Gaudí i Cornet (25 June 1852 – 10 June 1926) was a Catalan architect from Spain known as the greatest exponent of Catalan Modernism. Gaudí's works have a highly individualized, sui generis style. Most are located in Barcelona, including his main work, the church of the Sagrada Família. Seven (parts of) buildings are included in UNESCO's World Heritage Site, all of them located in the Province of Barcelona: Parque Güell, Palacio Güell, Casa Mila, Casa Vicens, Nativity Façade and Crypt of the Sagrada Familia, Casa Batlló, Crypt at the Colònia Güell.

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This cover from United Nations (New York Office) depicts 4 stamps (2 of eavch type), celebrating 2 Natural UNESCO World Heritage Sites in Australia: the Tasmanian Wilderness and the Kakadu National Park. The Tasmanian Wilderness is a term that is used for a range of areas in Tasmania, Australia. The World Heritage Areas in South West Tasmania, Western Tasmania and Central Highlands are the most well known. However, there are also other wilderness areas in Tasmania, Tarkine and the Cradle mountain wilderness. The World Heritage Area is one of the largest conservation areas in Australia, covering 13,800 km², or almost 20% of Tasmania. The area constitutes one of the last expanses of temperate wilderness in the world, including the renowned South West Wilderness. The area became a UNESCO World Heritage Site in 1982, and it was extended in 1989. Kakadu National Park is in the Northern Territory of Australia, 171 km southeast of Darwin. It is the second largest national park in the world.[3] It covers an area of 1,980,400 ha (4,894,000 acres).[4] It is about 200 kilometres from north to south, and more than 100 kilometres from east to west. It is the size of Slovenia, about one-third the size of Tasmania, or nearly half the size of Switzerland. The Ranger Uranium Mine, one of the biggest Uranium mines in the world, is inside the park. The area became a World Heritage Site in 1981.

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This cover from United Nations (New York Office) depicts 4 stamps (2 of eavch type), celebrating 2 UNESCO World Heritage Sites in Spain: the Historic Walled Town of Cuenca and the Historic City of Toledo. The Moors built the fortified city of Cuenca in the early 8th century, and it was captured by the Christians in the 12th century. The cathedral is the first Gothic example in Spain. The town is also famous for its casas colgadas, houses that hang over the edge of a cliff. It was declared a World Heritage Site in 1996. Toledo was founded by the Romans, served as the capital of the Visigothic Kingdom, was important in Muslim Spain and during the Reconquista, and briefly served as the capital of Spain. The city combines Christian, Muslim, and Jewish influences. The Historic City of Toledo was inscribed at UNESCO World Heritage list in 1986.

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This cover from United Nations (New York Office) depicts 4 stamps (2 of eavch type), celebrating 2 UNESCO World Heritage Sites in Greece: the Pythagoreion and Heraion of Samos and the Archaeological Site of Delphi. The Pythagoreion is the archaeological site of the ancient town of Samos in Samos, Greece. It is located in the area of the modern town of Pythagoreio, from which it has got its modern name. The archaeological site contains ancient Greek and Roman monuments and a famous ancient tunnel, the Tunnel of Eupalinos or Eupalinian aqueduct. Along with the Heraion of Samos, the Pythagoreion was registered as a UNESCO World Heritage Site in 1992. Delphi, in ancient times was a sacred precinct that served as the seat of Pythia, the major oracle who was consulted about important decisions throughout the ancient classical world. The oracle had origins in prehistory and it became international in character and also fostered sentiments of Greek nationality, even though the nation of Greece was centuries away from realization. The ancient Greeks considered the centre of the world to be in Delphi, marked by the stone monument known as the omphalos (navel). The sacred precinct occupies a delineated region on the south-western slope of Mount Parnassus. It is now an extensive archaeological site, and since 1938 a part of Parnassos National Park. Adjacent to the sacred precinct is a small modern town of the same name. The precinct is recognized by UNESCO as a World Heritage Site since 1987.

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This cover from United Nations (New York Office) depicts 4 stamps (2 of eavch type), celebrating 2 UNESCO World Heritage Sites in Greece: the Archaeological Sites of Mycenae and Tiryns and the Archaeological Site of Olympia. Mycenae and Tiryns were two of the most important cities of Mycenean Greece, which flourished between the 15th and 12th centuries BCE. The cities were palace economies with monumental architecture, such as the Lion's Gate and Treasury of Atreus. The Linear B tablets are the first testimonies of the Greek language. Both cities are linked to the Homeric epics Iliad and Odyssey, which have influenced the European literature and arts ever since. Tiryns was recognized as a World Heritage Site in 1999. Olympia is a small town in Elis on the Peloponnese peninsula in Greece, famous for the nearby archaeological site of the same name. This site was a major Panhellenic religious sanctuary of ancient Greece, where the ancient Olympic Games were held every four years throughout Classical antiquity, from the 8th century BC to the 4th century AD. They were restored on a global basis in 1894 in honor of the ideal of peaceful international contention for excellence. It was inscribed as a UNESCO World Heritage Site in 1989.

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This amazing cover from United Nations (New York Office) depicts a miniature sheet celebrating the Acropolis, in Athens. The Acropolis is an ancient citadel located on a rocky outcrop above the city of Athens and contains the remains of several ancient buildings of great architectural and historical significance, the most famous being the Parthenon. Originally a fortification, it gradually developed into a religious sanctuary, associated with the cult of the goddess Athena. In the 5th century BCE, following their victory over the Persians, the Athenians under Pericles constructed a large number of monuments including the Parthenon, the Erechtheion, the Propylaia, and the Temple of Athena Nike. The monuments in the Acropolis have prominently inspired the Neoclassical architecture. This site of an outsanding value is inscribed as an UNESCO World Heritage site since 1987.

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This cover from United Nations (New York Office) depicts 2 stamps of same ype, celebrating the Mausoleum of the First Qin Emperor. The Mausoleum of the First Qin Emperor (Qin Shi Huang) is located in Lintong District, Xi'an, Shaanxi province of China. This mausoleum was constructed over 38 years, from 246 to 208 BC, and is situated underneath a 76-meter-tall tomb mound shaped like a truncated pyramid. The layout of the mausoleum is modeled on the Qin capital Xianyang, divided into inner and outer cities. The tomb itself has not yet been excavated. Archaeological explorations currently concentrate on various sites of the extensive necropolis surrounding the tomb, including the Terracotta Army to the east of the tomb mound. The Terracotta Army served as a garrison to the mausoleum and has yet to be completely excavated. In 1987, the mausoleum, including the Terracotta Warriors, was listed as World Heritage Sites.

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This cover from United Nations (New York Office) depicts 2 stamps of same ype, celebrating the Mausoleum of the First Qin Emperor. The Mausoleum of the First Qin Emperor (Qin Shi Huang) is located in Lintong District, Xi'an, Shaanxi province of China. This mausoleum was constructed over 38 years, from 246 to 208 BC, and is situated underneath a 76-meter-tall tomb mound shaped like a truncated pyramid. The layout of the mausoleum is modeled on the Qin capital Xianyang, divided into inner and outer cities. The tomb itself has not yet been excavated. Archaeological explorations currently concentrate on various sites of the extensive necropolis surrounding the tomb, including the Terracotta Army to the east of the tomb mound. The Terracotta Army served as a garrison to the mausoleum and has yet to be completely excavated. In 1987, the mausoleum, including the Terracotta Warriors, was listed as World Heritage Sites.

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This cover from United Nations (New York Office) depicts 2 stamps of same ype, celebrating the Mausoleum of the First Qin Emperor. The Mausoleum of the First Qin Emperor (Qin Shi Huang) is located in Lintong District, Xi'an, Shaanxi province of China. This mausoleum was constructed over 38 years, from 246 to 208 BC, and is situated underneath a 76-meter-tall tomb mound shaped like a truncated pyramid. The layout of the mausoleum is modeled on the Qin capital Xianyang, divided into inner and outer cities. The tomb itself has not yet been excavated. Archaeological explorations currently concentrate on various sites of the extensive necropolis surrounding the tomb, including the Terracotta Army to the east of the tomb mound. The Terracotta Army served as a garrison to the mausoleum and has yet to be completely excavated. In 1987, the mausoleum, including the Terracotta Warriors, was listed as World Heritage Sites.

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This cover from United Nations (New York Office) depicts 2 stamps of same ype, celebrating the Mausoleum of the First Qin Emperor. The Mausoleum of the First Qin Emperor (Qin Shi Huang) is located in Lintong District, Xi'an, Shaanxi province of China. This mausoleum was constructed over 38 years, from 246 to 208 BC, and is situated underneath a 76-meter-tall tomb mound shaped like a truncated pyramid. The layout of the mausoleum is modeled on the Qin capital Xianyang, divided into inner and outer cities. The tomb itself has not yet been excavated. Archaeological explorations currently concentrate on various sites of the extensive necropolis surrounding the tomb, including the Terracotta Army to the east of the tomb mound. The Terracotta Army served as a garrison to the mausoleum and has yet to be completely excavated. In 1987, the mausoleum, including the Terracotta Warriors, was listed as World Heritage Sites.

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This amazing UNESCO cover United Nations (Office of New York) depicts a miniature sheet of 4 stamps celebrating Delos. The island of Delos, near Mykonos, near the centre of the Cyclades archipelago, is one of the most important mythological, historical, and archaeological sites in Greece. The excavations in the island are among the most extensive in the Mediterranean; ongoing work takes place under the direction of the Ephorate of Antiquities of Cyclades, and many of the artifacts found are on display at the Archaeological Museum of Delos and the National Archaeological Museum of Athens. Delos had a position as a holy sanctuary for a millennium before Olympian Greek mythology made it the birthplace of Apollo and Artemis. From its Sacred Harbour, the horizon shows the three conical mounds that have identified landscapes sacred to a goddess in other sites: one, retaining its Pre-Greek name Mount Kynthos, is crowned with a sanctuary of Zeus. In 1990, UNESCO inscribed Delos on the World Heritage List, citing it as the "exceptionally extensive and rich" archaeological site which "conveys the image of a great cosmopolitan Mediterranean port".

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This cover from United Nations (Office of New York) depicts 4 stamps (2 of each type) with pictures of two remarquable UNESCO sites in Australia: the Great Barrier Reef and the Willandra Lakes Region. The Great Barrier Reef is the world's largest coral reef. It is near the coast of Queensland, Australia. It is made up of nearly 2900 coral reefs and over 600 islands. It is 327,800 km2 big and 2600 km long. It has been listed an important World Heritage Site by UNESCO in 1981. The Willandra Lakes Region is a World Heritage Site that covers 2,400 square kilometres in south-western New South Wales, Australia. It includes important natural and cultural features. The lakes were formed about two million years ago, but are now dry. The Australian Aborigines camped around the lakes, especially in the sand dunes on the lake shores for at least 50,000 years. The Willandra Lakes Region was added to the Australian National Heritage List in May 2007.

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This cover from United Nations (Office of New York) depicts 4 stamps (2 of each type) with pictures of two remarquable UNESCO sites in Russian Federation: the Kizhi Pogost and the Historic and Architectural Complex of the Kazn Kremlin. Kizhi Pogost is a historical site dating from the 17th century on Kizhi island. The island is located on Lake Onega in the Republic of Karelia (Medvezhyegorsky District), Russia. The pogost is the area inside a fence which includes two large wooden churches (the 22-dome Transfiguration Church and the 9-dome Intercession Church) and a bell-tower. The pogost is famous for its beauty and longevity, despite being built exclusively of wood. In 1990, it was included in the UNESCO list of World Heritage sites. The Kazan Kremlin is the chief historic citadel of Russia, situated in the city of Kazan. It was built at the behest of Ivan the Terrible on the ruins of the former castle of Kazan khans. It was declared a World Heritage Site in 2000.

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This cover from United Nations (Office of New York) depicts 4 stamps (2 of each type) with pictures of two remarquable UNESCO sites in Russian Federation: the Ensemble of the Novodevichy Convent and the Lake Baikal. Novodevichy Convent, also known as Bogoroditse-Smolensky Monastery, is probably the best-known cloister of Moscow. Its name, sometimes translated as the New Maidens' Monastery, was devised to differ from the Old Maidens' Monastery within the Moscow Kremlin. Unlike other Moscow cloisters, it has remained virtually intact since the 17th century. In 2004, it was proclaimed a UNESCO World Heritage Site. Lake Baikal is a rift lake located in Russia situated in southern Siberia between the federal subjects of Irkutsk Oblast to the northwest and Buryatia to the southeast. Baikal is home to thousands of species of plants and animals, many of them endemic to the region. It is also home to Buryat tribes, who raise goats, camels, cattle, sheep, and horses on the eastern side of the lake, where the mean temperature varies from a winter minimum of −19 °C to a summer maximum of 14 °C. UNESCO declared Lake Baikal a World Heritage Site in 1996.

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This cover from United Nations (Office of New York) depicts 4 stamps (2 of each type) with pictures of two remarquable UNESCO sites in Russian Federation: the Historic Centre of Saint Petersburg and Related Groups of Monuments and the Kremlin and Red Square, in Moscow. Called The 'Venice of the North', St. Petersburg, with its numerous canals and more than 400 bridges, is the result of a vast urban project begun in 1703 under Peter the Great. Later known as Leningrad (in the former USSR), the city is closely associated with the October Revolution. Its architectural heritage reconciles the very different Baroque and pure neoclassical styles, as can be seen in the Admiralty, the Winter Palace, the Marble Palace and the Hermitage. Historic Centre of Saint Petersburg and Related Groups of Monuments is the name used by UNESCO when it collectively designated the historic core of the Russian city of St. Petersburg, as well as buildings and ensembles located in the immediate vicinity as a World Heritage Site in 1991. The site was recognised for its architectural heritage, fusing Baroque, Neoclassical, and traditional Russian-Byzantine influences. The ensemble of the Moscow Kremlin and Red Square is a masterpiece of human creative genius and the main symbol of the country. It took more than 500 years to form, reflecting the history of Russian architecture as well as relationship with the European cultural traditions. Architectural monuments of the Moscow Kremlin and Red Square are the finest examples of national architectural school. Moscow Kremlin was the residence of Great Princes and later the Tzar’s residence. Currently it is the seat of the President of the Russian Federation. The Moscow Kremlin is situated high on the left bank of the Moscow River on the Borovitsky hill. Kremlin walls have the shape of an irregular triangle and surround an area of 27 hectares. The southern wall facing the Moscow River, north-western - the Alexander Garden, the eastern - the Red Square. In 1990 the architectural complex of the Moscow Kremlin and Red Square were included to the World Heritage List of UNESCO.

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This cover from United Nations (Office of New York) depicts 4 stamps (2 of each type) with pictures of two world famous bridges, both inscribed as World Heritage Sites by UNESCO: the Forth Bridge in Scotland, United Kingdom, and the Old Mostar Bridge, in Bosnia and Herzegovina. The Forth Bridge is a cantilever railway bridge across the Firth of Forth in the east of Scotland, 14 kilometres west of central Edinburgh. Completed in 1890, it is considered as a symbol of Scotland (having been voted Scotland's greatest man-made wonder in 2016), and is a UNESCO World Heritage Site since 2015. The UNESCO site in Bosnia and Herzegovina encompasses the Old Bridge and the surrounding area. The Ottoman bridge, which crosses the Neretva river, was commissioned by Suleiman the Magnificent and completed in 1566/67. In 1993, during the Bosnian War, it was deliberately shelled and destroyed by the Croatian Defence Council. After the war, the bridge was rebuilt using traditional construction methods and local materials, and reopened in 2004. In 2005, all the historic area around the bridge was declared a World Heritage Site by UNESCO.

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This cover from United Nations (Office of New York) depicts 4 stamps (2 of each type) with pictures of two world railways, both inscribed as World Heritage Sites by UNESCO: the Mountain Railways of India and the Rhaetian Railway in the Albula/Bernina Landscapes, shared by two countries: Italy and Switzerland. The Mountain railways of India are the narrow-gauge railway lines that were built in the mountains of India. Three of them, the Darjeeling Himalayan Railway, the Nilgiri Mountain Railway, and the Kalka–Shimla Railway, are collectively designated as a UNESCO World Heritage Site under the name "Mountain Railways of India". The fourth railway, the Matheran Hill Railway, is on the tentative list of UNESCO World Heritage Sites. All four are narrow-gauge railways, and the Nilgiri Mountain Railway is also the only rack railway in India. The Rhaetian Railway , abbreviated RhB, is a Swiss transport company that owns the largest network of all private railway operators in Switzerland. Inaugurated in 1888 and expanded from 1896 onwards in various sections, the RhB network is located almost entirely within Grisons, with one station across the Italian border at Tirano. The Rhaetian Railway serves a number of major tourist destinations, such as St. Moritz and Davos. One of the RhB lines, the Bernina Railway, crosses the Bernina Pass at 2,253 metres above sea level and runs down to Tirano, Lombardy in Italy. In 2008, the RhB section from the Albula/Bernina area (the part from Thusis to Tirano, including St. Moritz) was added to the list of UNESCO World Heritage Sites.

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Another cover from United Nations (New York Office), depicting 4 stamps (2 of each type) celebrating 2 Heritage Sites in Cuba: the Historic Centre of Camagüey and the Historic Centre of Cienfuegos. Camagüey was founded as Santa María del Puerto del Príncipe in 1514, by Spanish colonists on the northern coast and moved inland in 1528, to the site of a Taino village named Camagüey. It was one of the seven original settlements (villas) founded in Cuba by the Spanish. After Henry Morgan burned the city in the 17th century, it was redesigned like a maze so attackers would find it hard to move around inside the city. In July 2008, the old town was designated a UNESCO World Heritage Site, because of its irregular, maze-like city planning, its prominent role in early Spanish colonization and agriculture, and its rich architecture showing a variety of influences. The Historic Centre of Cienfuegos, is located in the city of Cienfuegos. It was declared a UNESCO World Heritage Site in 2005, because of its outstanding Neoclassical architecture architecture and its status as the best example of early 19th century Spanish urban planning. The historic centre contains six buildings from 1819–50, 327 buildings from 1851–1900, and 1188 buildings from the 20th century.