Aqueducts have dramatically changed this old lake, now home to tufa towers and its very own species of tiny brine shrimp.

The ancient dwellings of the Puebloans, located in the cliffs of majestic mesas.

Ruins of a German Castle on top of a towering stone pillar.

These fantastically named natural pools look like something out of a Scottish myth.

This abandoned asylum was once a state of the art facility before devolving into one of the most deadly mental institutions in American history.

In this historic region, homes and churches are carved into ancient volcanic rock formations.

A battle between nature and architecture in the Cambodian jungle.

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

The world's highest and most dangerous infinity pool lies at the precipice of Victoria Falls.

Monasteries on rock pillars, once accessible only by frayed ropes.

A spectacular cave and a beguiling lake.

The tragic reality of a town riddled with rumors of haunts, chemical spills, and serial killers.

The first declared National Monument in the United States.

Thousands of exquisitely carved stone water storage wells, hundreds of stone steps fill this exquisite medieval stepwell.

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

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

Enormous lake at the bottom of a unique cave system.

Site of a former hidden treehouse in New Orleans.

Towering basalt columns, a creation of fire and ice.

The unique waterfall in Iceland's south features a backdrop of geometric black lava columns.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

The world's only museum devoted to the wonders of fluorescence.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

Remnants of a storybook amusement park hidden behind a strip mall.