Address: Dien Bien Phu Str, Ba Dinh, Hanoi, Vietnam
Built in 1812, the tower, unlike many other structures in Hanoi, was not destroyed during the French administration (1896-1897), and was used as a military post. It is now located in the Vietnam Military History Museum.
Flag Tower is located on Dien Bien Phu street, Ba Dinh district, Hanoi; near Ba Dinh Square. Hanoi Flag Tower, also called Cot Co, is one of the rare architectural works in Hanoi .
It was used by French troops as an observation tower and communication station between command headquarters and adjacent military posts.