Khao Wang Thong is an impressive network of 17 caves and narrow passages that reaches a depth of 150m. Visitors walk past a series of natural limestone formations likened to dinosaurs, pagodas and lotus flowers, as well as impressive stalactites hanging from the roof. The complex is lit up by a string of lights and is also home to bats. Bring a solid pair of shoes and a head torch. Off Hwy 4014 between Khanom and Don Sak.