East of Reykjavik lies a mountain named Hengill. Hengill was formed from a Palagomite tuff and its highest point is around 800 metres above sea level. Hengill is a central volcano and has a giant magma chamber beneath it.
rock formations inside carlsbad caverns national park in new mexico. stalactites stalagmites and stone columns illuminated for display by the park lighting system. this area is called the doll\'s theater - a stock photo
Cavern Tours Georgetown, TX Central Texas has cave after cave. The area is known as the Hill Country, and you can visit caverns and caves all over the area centering around Austin. I have been to several and enjoyed them.
A caver gazes at a stone formation in Tham Lum Khao Ngu (Snake Mountain Cave) in Kanchanaburi, Thailand, which houses the world’s tallest cave column or tall)Picture: John Spies / Barcroft Media Amazing photographs of huge cave systems in Thailand