13.) Phraya Nakhon Cave, Thailand
Located in Prachuap Khiri Khan province in Thailand. This cave is locally named as Tham Khao Luang Cave, discovered about 200 years ago by Chao Praya Nakhon Sri Thammarat while he was in search for a shelter during a big storm. Now, this cave is managed by Khao Sam Roi Yot National Park. This vast cave can be reached by renting a boat or walking across Tian Mountain.
