This crack in France's seaside cliffs once hid a sinister secret.

South Dakota's oldest operating brewery is housed inside a historic firehouse.

A recreation of an Old West apothecary full of curios.

This massive geographical sculpture is so subtle, it's possible to pass by it without noticing.

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

Colorado's only true geyser is hidden within the San Juan National Forest.

Michael Heizer's masterwork in the Nevada Basin.

An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

The giant stump of the once towering cottonwood where Ute people held tribal meetings.

Ancestral Puebloan ruins, natural arches, and box canyons abound in this seldom-visited corner of Monument Valley Navajo Tribal Park.

A well-preserved Ancestral Puebloan ruin tucked beneath a desert cliff.

This UFO landing strip was created by a charitable Wyoming city that was worried about residents of Jupiter.

Most-visited and most-photographed slot canyon in the American Southwest.

This isolated outpost was once the only place to cross the Colorado River for hundreds of miles.

Dramatic river bend surrounds a natural red-rocked pedestal.

Rich red almandine gemstones are waiting inside the volcanic rock strewn across this eastern Nevada hillside.

These huge stone ovens in the desert fueled the Nevada silver boom, and may have also been a hideout for outlaws.

Giant pinnacles in the sun-scorched lands of Southern Utah have been nicknamed "white ghosts."

This ghost town was once a cult-like religious utopian settlement.

This rugged area of red rocks and arches is often considered one of the most beautiful places on Earth.

This quiet park's strange sedimentary spires were named after Kodak's color film.

Giant, natural amphitheaters made of delicate geological formations called "hoodoos."