Introduction to the Bell and Drum Tower: The Bell and Drum Tower of Nanhai Film and Television City is actually a watchtower, which is a military facility called a watchtower today. During the Taiping Heavenly Kingdom, it was also called a watchtower and a demon-watching tower. The Taiping Army built watchtowers on taller buildings or on higher ground in the cities they occupied and in their camps, so that they could climb the towers and see far away.