The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

A beautiful geyser under environmental threat.

The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

The source of America's longest river is also a historical landmark and the start of a famous nude run.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.

A short interpretive trail about one of the first human cultures in North America.

Not truly a ship nor a building, the Navy's first and last "landship" is now abandoned due to clerical issues.

In Tucson a giant metal snake helps pedestrians cross a busy highway.

Legend says train robbers stashed their gold within the depths of this unusual cave.

This rural museum is home to more than 50 local desert reptiles and the world's largest snake bite kit collection.

This open-pit mine is now an abandoned symbol of Bisbee's copper-mining heritage.

This Old West hotel, the longest in continuous operation in the state of Arizona, is claimed to be haunted.

Out of a desire to feed hungry soldiers, a franchise-altering idea was born.

Lonely industrial sculptures in South Australia created by a mechanic turned artist.

This sacred site lives up to its name with its majestic, color-splashed sandstone formations.

This unassuming cheese empire in rural Oregon churns out more than 150,000 pounds of cheese each day.

One of the oldest Mexican restaurants in the United States air-dries its trademark beef in a dangling outdoor cage.

A living museum of curated gardens honors 4,000 years of agriculture in the Santa Cruz River basin.

A rare wayfinding portmanteau of “Street” and “Avenue.”

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

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

This Moab institution functions as both a rock store and a small natural history museum.