天安门的介绍

Area of Tiananmen Square
Tiananmen Square is the largest downtown square in the world. It covers an area of 44 hectares, big enough to hold one million people. From the red wall of the Tian'anmen Rostrum in the north to the south gate, it measures some 880 meters, and from the Museum of Chinese Revolution and Chinese History in the east to the Great Hall of the People in the west, it is about 500 meters.
Name source
Tian'anmen square is named after its magnificent Tian’anmen Rostrum (Gate of Heavenly Peace), which was the first gate of the Imperial City.

Tian’anmen Square today
Now Tiananmen Square is one of the most famous and popular places in China. It is the place for celebrations on such festive days as International Labor Day on May 1 and National Day on October 1. Tian'anmen Square had completed its renovation to welcome the 50th anniversary of China in 1999.