There are alot of great caves in the US but there is a hot debate over which one is better Mammoth Cave or Carlsbad Caverns.

An international team of researchers has suggested a "wild" new theory to explain the creation of these mysterious ancient ...

Wisconsin gets incredibly cold in the winter, but don't let that frighten you into staying indoors: these incredible ice caves are calling.

This world-famous natural wonder, which is situated about 120 miles south of Auckland, features a boat ride through Glowworm Grotto, where thousands of glowworms illuminate the cave ceiling.