What are the names of the five nails?

Watchtower. Five nails are called watchtowers. After the Olympic Games, many new buildings have been added to the north of the Bird's Nest. It is estimated that many people have never been there, or can't even name them. It is the five nails often mentioned on the internet, also known as the watchtower and the Olympic tower, but generally speaking, the five nails sound more vivid.