A nice UNESCO cover from Vietnam, depicting 2 stamps of same type celebrating the
Thang Long Citadel. The
Central Sector of the Imperial Citadel of Thăng Long is 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.
