A nice UNESCO cover from Vietnam, depicting a joinmt issue with Cuba issued in 2020. This set celebrates two UNESCO sites: Santo Domingo de Atarrés Fortress in La Habana (Cuba) and Thanh Long Citadel in Vietnam. The Santo Domingo de Atarrés Fortress its part of the UNESCO site called "Old Havana and its Fortifications" - in 1982, Old Havana was inscribed in the UNESCO World Heritage List, because of its unique Baroque and neoclassical architecture, its fortifications, and its historical importance as a stop on the route to the New World. A safeguarding campaign was launched a year later to restore the authentic character of the buildings. The Imperial Citadel of Thăng Long i8s a complex of historic imperial buildings located in the centre of Hanoi, Vietnam. It was first constructed in 1011 under the reign of Emperor Lý Thái Tổ of Lý dynasty and its inscribed in the UNESCO World Heritage List since 2010.
