Bizarre lunar-like landscape with thousands of large stone "hoodoos."

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

A house carved into a rock in the 1940s.

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

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.

A gothic palace of endless stalagmites and pseudoscorpions waits within one of the world's most beautiful caves.

The longest living non-clonal organisms on Earth.

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

This church on a Tohono O'Odham reservation has stood since 1797.

A strenuous, unofficial trail leads to spectacular views in one of America's most remote national monuments.

Red sandstone structures dominate this landscape, which has been inhabited for some 5,000 years.

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

After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.

This oasis-like spring in the Sonoran Desert is home to unique, endangered species.

The biggest solar telescope in the world helps reveal the secrets of our sun.

Some of the tallest ancient American ruins continue to inspire awe and curiosity.

Limestone caves with spectacular showcase chambers.

A classic Route 66 landmark that was built with scrap lumber and is held together with kitsch and puns.

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

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

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

Taking the 3D art experience far beyond blue and red glasses.

Remember that scene in the Matrix, when Neo is in the big white room with all the weapons flying by? Well, this is what it would look like if he had wanted trees instead of guns.

A stunning landscape of bunkers that once stored chemical weapons.