Explore the ancient caves of Hang Son Doong, Vietnam. Hang Son Doong is one of the largest caves in the world and features a fast-flowing underground river. For spelunkers, exploring Hang Son Doong is the equivalent of scaling Mount Everest.
The map of Railay peninsula which depicts Railay East, Railay West, Phra Nang Cave Beach, Railay Viewpoint, Lagoon and Ton Sai. Ton Sai is the most fun part of the entire Railay Peninsula. http://drifterplanet.com/stunning-beauty-railay-ton-sai-phra-nang-krabi-province/
Submerged tree in the Green Lake. The Green Lake or Grüner See is a lake in Austria that dries out almost completely during fall, is used as a county park in the winter and is famous for the underwater park which forms during the spring due to snow melt