Zhengyangmen Gate, commonly known as Qianmen, Qianmen Tower and Daqianmen, was formerly named Lizheng Gate. It is the south gate of the inner city of Beijing in the Ming and Qing dynasties. It is located at the southernmost end of Tian’anmen Square on the north-south central axis of Beijing City and south of Chairman Mao Memorial Hall. Built in the 17th year of the Yongle era during Emperor Chengzu’s reign of the Ming Dynasty (1419 AD), it was one of the "nine gates" of ancient Beijing. It consists of Zhengyangmen gate tower, arrow tower and barbican city, forming a complete ancient defensive building system. 

According to local chronicles, the towers and arrow towers of that time were large and tall. The towering barbican city was a representative part of the city wall of ancient Beijing. Only the gate tower and the arrow tower have survived to this day. It is the only well-preserved city gate in Beijing. The Beijing Folk Customs Exhibition Hall is located in the gate tower. On January 13, 1988, the State Council included it in the list of the third batch of key cultural relics under national protection.