This tiny patch of arid sand sits in one of the greenest states in the United States.

The world is full of swimming holes, but few compare to Samoa’s idyllic To Sua ocean trench.

Australian Lake set aglow by Noctiluca Scintillans.

A modernist landscape of water and sci-fi concrete.

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

Walk 2,300 feet above the ground on the "Troll's Tongue."

A stunning, two-tiered waterfall made famous by poets, artists and the legend of a ghost dog.

A chain of 16 wondrous lakes formed as a result of the gradual dissolution of soluble layers of bedrock.

A beautiful bamboo trail tucked in this famous Japanese Shrine.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

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

If you can look past the nearby sewer pipes, this urban sinkhole grotto is a mini-paradise.

These azure waters were thought to lead to the Mayan Underworld.

Every equinox this Maya pyramid puts on a spooky ancient light show.

This portion of a lovely Belize beach is infested with (harmless) sharks and rays.

A massive underwater sinkhole made famous by Jacques Cousteau.

Medicinal spa created with the discharge from a geothermal energy plant.

A lovers' beach, tucked below the surface of the island, provides a safe haven for romance.

An exquisite tunnel of cascading flowers.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

An ethereal glowing blue ocean cave in Croatia.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.