Hundreds of drawings left by the land's previous inhabitants remain mysterious.

This giant ice cream cone is the last remaining icon of a Salt Lake City staple.

Here lies Lilly E. Gray, an alleged "victim of the beast," but the reason long remained a mystery.

The notorious Wild West outlaw was raised in this unassuming abode.

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

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

A tunnel with windows, so you don't miss out on the impressive views.

An earthwork sculpture built by Robert Smithson in the Great Salt Lake only reemerges during drought.

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

The trunks of 3,000 year-old trees lurk beneath the surface of this crystal clear lake in Oregon.

A house carved into a rock in the 1940s.

The short-lived railroad town in central Oregon has been abandoned since the 1930s.

Two massive rock outcroppings on the Oregon coastline.

The only quarter of the Old City not dedicated to a major world religion.

The mayor made the declaration in 2004.

This giant meditative chakra sits peacefully in the Flathead Valley of western Montana.

Finally the worlds of UFO enthusiasts and beef jerky lovers have come together in this roadside shop.

This funicular railway rumbles along for a mile up the nearly vertical face of Chattanooga’s Lookout Mountain.

The mysterious wonder of an underground waterfall is illuminated by multicolored lights.

Few things look more out of place than the electric blue ponds in the reddish-brown desert of Utah.

The fifth-longest natural arch in the world, and the longest outside China.

The marker offers a rare chance to be in four U.S. states at once, though there's some controversy over its geographic accuracy.

This little slice of the Netherlands in the Pacific Northwest blooms in a rainbow of color each spring.

The unique circular corral belonging to the “Cattle King” of Oregon.