![Karst cave in Tai'an offers geological wonders(1/6)](http://www.ecns.cn/hd/2018/04/09/9ffc65807bfd4ad98b76bffa0a5b467d.jpg)
Vividly bright stalactites hang from the ceiling of a karst cave in Dongyanglou village, Tai'an city, in East China's Shandong Province. Crustal deformation that took place billions of years ago resulted in a great rift valley between Mount Taishan and Culai Mountain, an underground valley that later turned into the biggest karst cave in the world. It houses a great variety of stalactites and each is a unique formation. The cave was discovered accidentally in 2003 and is now open to visitors, who can appreciate the cluster of geological wonders. The scenic spot is a 4A-level tourist site and attracts over 2 million visitors annually from home and abroad. (Photo/China Daily)