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

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

Odd outsider art installations surround a Gold Rush-era ghost town.

San Francisco's newly reopened hands-on science museum.

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

Towering basalt columns, a creation of fire and ice.

A beautiful geyser under environmental threat.

Relics of the 1894 Midwinter Exposition continue to delight visitors today.

The rocks in this arid basin leave trails of movement behind them.

Carnivorous plants, medieval aphrodisiacs, and the largest original wood structure glass conservatory in the western hemisphere.

The first declared National Monument in the United States.

A trash dump made beautiful by nature's power.

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 deepest lake in the United States, and once the site of epic destruction that lives on in legends.

A winding path built in secret on the edge of the continent.

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

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

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

A huge musical instrument played by the ocean.