This beautiful system of tunnels built into natural rock serves as a centuries old plumbing system.

A small, but award-winning beach known for its literally spotless reputation.

A magically clear, blue river that seems to spring from nowhere.

Hidden deep within a Filipino jungle is an incredible waterfall that plunges into a dazzling blue-green pool.

Two ancient Buddhist temples crown this dramatic rocky pinnacle.

This curious fresh and salt water lake holds a secret that draws in deep divers from around the world.

The remote island home of the overlooked explorer who co-discovered the theory of evolution by natural selection.

A sinkhole and now a swimming hole, too, full of dazzling turquoise water.

The remote outlaw hideout of Jesse James, Butch Cassidy, and the Sundance Kid.

The watery grave of Captain Bligh's famous ship.

A flooded Mexican cave that hides a river beneath the water.

The stoutest tree in the world.

A seemingly endless landscape of pure salt stretches far across Bolivia.

World's largest cave was only discovered in 1991, and now offers tours to the public.

This "floating island" plateau sits 7,671 feet above the forest floor.

The world's widest single drop waterfall, and the two men who legend says went over its edge in a boat.

Bohol's mysterious brown hills.

A patch of Philippines forest devoted to saving the lives of an emotionally sensitive species of googly-eyed primates.

These tiered rice paddies were carved into the hillsides 2,000 years ago.

This wondrous waterfall rushing down a green-covered mountain wasn't discovered until 2010.

Five miles of underground river link lake to ocean.