Hong Kong CNN  —  Visitors to a centuries-old tourist site in eastern China were sent scrambling after hundreds of roof tiles came loose and cascaded more than two stories to the ground. The Fengyang Drum Tower—built in 1375 and used to announce the beginning of ceremonies and the time of day—is one of the largest such towers in China, according to state media. The tower is a major tourist attraction in Anhui province, which is 167 miles away from Beijing, China’s capital. But on Monday the