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

A breathtaking array of ancient Pueblo structures and artifacts counterintuitively preserved by neglect.

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

Explore a wealth of fossils in one of the most prolific dig sites in North America.

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

A house carved into a rock in the 1940s.

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

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

Most-visited and most-photographed slot canyon in the American Southwest.

These mid-century motels once housed the workers who built the Glen Canyon Dam.

A sharp bend in a dramatic river canyon cut through red rocks.

When it was built in 1929, this historic bridge was the only place to cross the Colorado River for 600 miles.

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

This rusted car found in Petrified Forest National Park's Route 66 exhibit may be the most photographed abandoned car in the country.

See massive fossils that are over 200 million years old in northeastern Arizona.

Giant steel and concrete dinosaurs near Route 66 invite passerbys into a mineral shop.

Ninety feet off the valley floor is an ancient dwelling put under protection of the U.S. government by Teddy Roosevelt.

This vast and otherworldly landscape is one of the largest dune complexes in North America.

This immigrant bridge once spanned the Thames but is now a fixture of an Arizona city.

More than 25 fully functional scale replicas of famous lighthouses dot the shores of Lake Havasu.

A living snapshot of a different time in America is preserved and maintained by a community of volunteers.

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.

Stairs often replace streets on the steep slopes of this old mining town.