Beijing, the city of great antiquity, has the Bell Tower in the north and Drum Tower in the south, respectively at the front and the end of Di'anmen Street—on the central axis of the imperial city, which are echoed by the Jingshan Mountain in the south. As the time-telling center of capital Beijing in the Yuan, Ming and Qing dynasties, the Bell Tower and Drum Tower are the landmark buildings in ancient capital city Beijing.