This cover came from United Nations Vienna and depicts 3 stamps of the same type celebrating the
Palace of Schönbrunn in Vienna. Schönbrunn Palace park in Vienna, which has been open to the public since 1779, is home to the Desert House, the Orangery, the Privy Garden, and the Palm House built in 1882. It is featured on the commemorative stamp and used to be the world’s largest glass structure. Schönbrunn Palace was the residence of the Habsburg emperors from the 18th century to 1918. It was built in the Rococo style as a single, unified project. It was designed by the architects Johann Bernhard Fischer von Erlach and Nicolaus Pacassi and is the site of the world's oldest continuously operating Zoo. The
Palace and Gardens of Schönbrunn are inscribed as an UNESCO World Heritage site since 1996.
