This Is The Northwest Corner Tower Of The Forbidden City In Beijing. Corner Towers On The Four Coigns Of Lofty Walls Of The Forbidden City -- The Imperial Palace During Ming And Qing Dynasties Of China -- Were Established In 1420, Rebuilt In The Qing Dynasty (1644-1911). As One Part Of The Forbidden City, They Served As The Defense Facility Just As The Lofty Walls, The Gate Towers And The Moat. Photo