The Yongdingmen Gate was first built in 1553. In order to build up Beijing's defense during the Ming dynasty, seven city gates were built for the outer city, with the Yongdingmen Gate being the largest and the highest ranked. The wengcheng barbican was added on the south side of the Yongdingmen Gate Tower in 1564. The archery tower was built on the wengcheng barbican in 1750. In the 1950s, Beijing was developing rapidly and the problem of traffic congestion in the Yongdingmen area became increasingly acute. In 1951, the Yongdingmen Gate's wengcheng barbican was demolished to open up traffic inside and outside the old city of Beijing. The Yongdingmen Gate Tower and Archery Tower were demolished in 1957 to relieve traffic pressure. The southern moat was dredged and straightened, and the roads and streets in the Yongdingmen area were widened simultaneously. The Beijing Municipal Institute for Cultural Heritage carried out archeological excavation work on the site of the Yongdingmen Gate in 2003. Seven exploratory trenches of different lengths were excavated to determine the gate tower's boundary. The Yongdingmen Gate's reconstruction project started in 2004 and was completed in the following year. The reconstruction work was strictly based on the archeological findings and research results from the historical records. The reconstructed Yongdingmen Gate identifies the southern end of Beijing Central Axis.