1 Best Sight in Southwestern China, China

Discovered in 1531, Unicorn Cave was used as a prison for the two Nationalist generals, Yang Hucheng and Chang Xueliang, who were accused of collaborating with the Communists when Chiang Kai-shek was captured at Xi'an in 1937. The cave is known for its unicorn-shape stalactite and used to host a nunnery.