A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

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

The hike through a narrow river flanked by the 2,000-foot-tall walls of Zion Canyon is one of the best in the world.

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

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

A beautiful geyser under environmental threat.

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

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

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

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

Settled by the Church of Jesus Christ of Latter-day Saints in 1859, this abandoned frontier town has appeared in several films.

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.

A house carved into a rock in the 1940s.

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

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

A ghost town that held steady longer than most, but finally gave up the ghost.

This former rail stop in Utah was abandoned, repopulated by some nostalgic friends, and now is home to a single DIY aviator who lives in a hangar.

Here, at the “world’s longest art gallery,” you’ll find forty miles of ancient petroglyphs and pictographs.

A museum in rural Utah documents the history of the Japanese Americans who were forcibly relocated there.

A 90-foot-tall psychedelic "tree" on the side of the highway has baffled passersby for decades.

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