This canyon is named for a unique geologic formation where the river vanishes underground near the mouth of the canyon and reappears farther down.

The world's largest mineral hot springs is home to a herd of bison, a free public bath house, beautiful mineral formations, and a terrifying swinging bridge.

This archaeological dig site and museum is home to one of the largest dinosaur fossil collections in the world.

This 35-foot troll in Jackson Hole, Wyoming, was made by the world’s leading recycling artist as part of a global fairytale.

These faux-cliff dwellings allow visitors to climb around on a replica archaeological site.

This maintained cabin is where Josie Morris, an occasional associate of Butch Cassidy, lived out the last 50 years of her life by herself.

Inside this striking glass building, visitors can see thousands of dinosaur fossils in the positions that nature deposited them more than 150 million years ago.

This geothermal hot spring hides beneath a slowly growing mineral dome.

During World War II, over 13,000 people of Japanese ancestry were forcibly removed from their homes and incarcerated in this camp in the Idaho desert.

One of America's largest retail chains got its start in one of its most remote rural destinations.

Evanston's historic railroad complex saved this rail town from reaching the "end of the line."

Named for a prominent scout and explorer, this Wyoming state park encompasses a replica of an 1840s trading post, a 19th-century Army outpost, and early 20th-century automobile lodgings.

Native Americans built this circle of stones, which was used to predict astronomical events.

In Washington's Yakima Valley lies a town "where dinosaurs roam."

Site of a tragedy on the Oregon Trail.

A stunning landscape of bunkers that once stored chemical weapons.

A crack flared at the base provides a pathway completely through a sandstone ridge near Moab.

A dangerous narrow-gauge railroad once traced a route through this striking canyon.

Take a dip in the world's largest mineral hot springs pool.

Thanks to a quirk of elevation this gift shop produces magic doughnuts that are found nowhere else on Earth.

When ecosystems collide in the arid Southwest.

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

Strange red rock formations that have been attributed to a higher power for hundreds of years.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.