Qianmen is the colloquial name for Zhengyangmen, a gate in Beijing's historic city wall. The gate is situated to the south of Tiananmen Square and once guarded the southern entry into the Inner City. Although much of Beijing's city walls were demolished, Zhengyangmen remains an important geographical marker of the city. The city's central north-south axis passes through Zhengyangmen's main gate. It was formerly named Lizhengmen, meaning "beautiful portal".