The Flag Tower of Hanoi (Vietnamese: Cột cờ Hà Nội) is a tower in Hanoi, Vietnam, which is one of the symbols of the city and part of the Hanoi Citadel, a World Heritage Site. Its height is 33.4 m (41 m with the flag).
Built in 1812, the tower, unlike many other structures in Hanoi, was not destroyed during the French administration (1896-1897), being used as a military post.
This is the historical central area of Hanoi, capital of Hanoi. Hanoi estimated population 3,398,889 (2007), is the capital and second-largest city of Vietnam. From 1010 until 1802, with a few brief interruptions, it was the political centre of an independent Vietnam. It was eclipsed by Huế during the Nguyen Dynasty as the capital of Vietnam, but Hanoi served as the capital of French Indochina from 1887 to 1954. From 1954 to 1976, it was the capital of North Vietnam.