More to explore:
The Son Doong Cave in Vietnam is the biggest cave in the world. It's over 5.5 miles long, has a jungle and river, and could fit a 40-story skyscraper within its walls.
Worlds biggest cave in Vietnam - there is a forest inside!
Hang San Doong, "mountain river cave" in central Viet Nam.
Into A Moss Grown Cave. - Its a Long Climb out. Caving helmets with lights, climbing gear, caving suits, and all the required equipment...
The Cave Of Three Bridges
Fingal Cave, Scottland
Old Man's Cave Gorge, in Ohio
Located at the southern end of Okinawa island, Gyokusendo Cave is the second largest series of caves in Japan and is considered to have the best stalactites and stalagmites in all Asia.
Maijishan Grottoes, Tianshuie China. Situated in Gansu Province in the northwest of China, this astonishing example of cave architecture hewn from rock consists of over 7,000 Buddhist sculptures and almost 1000 square meters of murals.
Melissani Cave, Kefalonia, Greece
Blue Ice Cave @ Skaftafell, Iceland