This cave was once thought to be a hiding place for the devil.

In the heart of Luxembourg's "little Switzerland" weaves a breathtaking natural sandstone canyon with a mythological past.

The Grand Canyon of Texas.

This interpretive path lets you get up close and personal with dinosaur bones.

Even in death, he's still your huckleberry.

One of the most extensive and well-preserved collections of dinosaur footprints in North America.

This raised bulls-eye visible from space was the subject of an intense geologic controversy.

A time-capsule monument reminding future generations of the importance of efficient and effective use of natural resources.

A stealthy Apache hideaway that became the haunting site of a mass grave.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

A pair of giant roadside arrows are all that remains of a former Route 66 trading post.

This Colorado hiking trail provides a small gold mine of abandoned gold mines.

Witnessing the might of this dessert-colored desert waterfall is a rare, powerful treat.

A river runs through this remote valley in a very unexpected way.

One of the world’s largest collections of petroglyphs records 2,000 years of human activity.

Only a few signs remain of the buried Colorado mining town that supplied the uranium for the first atomic bomb.

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

Oddly shaped rock formation, misassociated with a nearby utopian community.

The highest bridge in America was built for an almost unnervingly small amount of money.

This naturally-sourced hot spring is now home to a clothing-optional resort.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

Steep canyon walls hide a forested oasis in the West Texas desert.

The largest dinosaur trackway in North America is tucked away among this canyon's ghosts and archaeological gems.

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