Qianmen (simplified Chinese: 前门; traditional Chinese: 前門; pinyin: Qiánmén; literally "Front Gate") is the colloquial name for Zhengyangmen (simplified Chinese: 正阳门; traditional Chinese: 正陽門; pinyin: Zhèngyángmén; Manchu: Tob šuni duka, meaning "gate of the zenith Sun"), 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, Qianmen 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 (simplified Chinese: 丽正门; traditional Chinese: 麗正門; pinyin: Lìzhèngmén), meaning "beautiful portal".
Zhengyangmen was first built in 1419 during the Ming Dynasty and once consisted of the gatehouse proper and an archery tower, which were connected by side walls and together with side gates, formed a large barbican. The gate guarded the direct entry into the imperial city. The city's first railway station, known as the Qianmen Station, was built just outside the gate. During the Boxer Rebellion of 1900, the gate sustained considerable damage when the Eight-Nation Alliance invaded the city. The gate complex was extensively reconstructed in 1914. The Barbican side gates were torn down in 1915.
After the Communist victory in 1949, the Zhengyangmen gatehouse was occupied by the Beijing garrison of the People's Liberation Army. The military vacated the gatehouse in 1980, which has now become a tourist attraction. At 42 metres high, the Zhengyangmen gatehouse was, and remains, the tallest of all gates in Beijing's city wall. Zhengyangmen gatehouse survived the demolition of city walls in the late 1960s during the construction of the Beijing Subway. While others such as the Deshengmen in the north and Dongbianmen in the southeast only have their archery towers standing. Xibianmen retains only part of its barbican. Yongdingmen's gatehouse was rebuilt in 2007.
Today, Qianmen Avenue (Dajie) cuts between the Zhengyangmen gatehouse and the archery tower to the south. Line 2's Qianmen Station is also located between the two structures inside the space once surrounded by the barbican.
Geographical Significance 
The Zhengyangmen is situated on the central north-south axis of Beijing. The main gateway of the gatehouse is aligned with Yongdingmen Gate to the south, the Mausoleum of Mao Zedong and the Monument to the People's Heroes in Tiananmen Square, the Tiananmen Gate itself, the Meridian Gate, and the imperial throne in the Hall of Supreme Harmony in the Forbidden City, the city's Drum and Bell Towers and the entrance to the Olympic Green in the far north.
The kilometer zero point for highways in China is located just outside the Zhengyangmen Gate. It is marked with a plaque in the ground, with the four cardinal points, four animals, and "Zero Point of Highways, China" in English and Chinese.
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- Story about Qianmen hutong from The World program, July 8, 2008