Vietnam is generally good to play, okay
It is located near the cho dong xuan market in Dong Xuan. Generally, after visiting the night market on 36th Street in Hanoi, you will see the water tower when you reach the market in Dong Xuan. There is a bus station near the water tower, 22 bus, this bus also passes near Hoan Kiem Lake. No tickets are charged, it is a three-story cylindrical water tower. Should be left over from the French period.
Now it has become a tourist spot, you can go around.