25 of the World’s Most Beautiful Caves

Jenolan Caves, Australia

These grottos are the oldest (discovered) open system in the world and the first to have electric lighting installed in them, a feat completed in 1880. You can experience the amazing underworld through any of the 10 show caves by guided tours or take on a more challenging route if you’re up for crawling, squeezing, and climbing in undeveloped areas like a true adventurer – just be prepared to get down and dirty!