Every Ming city (1368-1644) had a bell tower and a drum tower. The bell was sounded at dawn and the drum at dusk. The two buildings at Xian are the best known in China. The Bell Tower was built in the city center and from the top can enjoy a panoramic view of the whole of Xian. Not far away to the west is the Drum Tower, a large drum inside was for marking the passage of time each night in ancient times. Now, they are outstanding examples of the ancient architecture of Xi'an.