The tower was built in 1812 as an observation post. Unlike many other buildings in Hanoi, it was not destroyed during the French invasion (1896-1897), but has been used as a military base. It is now located at the Vietnam Military History Museum. Since the stairs are steep, climbing up the tower can be difficult, so be careful when going up and down the tower. Once you climb up the tower, you can have a bird's eye view of the Military History Museum. Worth a visit when you visit the Vietnam Military History Museum. You can come to this military museum to see, this building tower is located in an impressive place, the tower itself is not that high, it has a flagpole and flag on the top, it is worth a look if you want to visit the museum but not recommend to all.