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

This unique competition celebrates an American Indian and Canadian First Nation cultural tradition.

One of the most extensive and well-preserved collections of dinosaur footprints in North America.

An off-the-beaten path cave with an underground lake.

This old selenite mine is dotted with tiny crystals that make it shimmer like it's covered in glitter.

Hike the unusual hoodoos and rock formations that form this little-known natural wonder.

This striking public art installation is suspended above a public park, designed to gently move in the breeze.

The artist James Turrell is repurposing an extinct volcano crater as an observatory to experience the cosmos.

An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.

Eons ago, a rushing lava river formed this pristine passage through solid rock.

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 self-built castle made by a mysterious man.

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

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

Dramatic river bend surrounds a natural red-rocked pedestal.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

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

Rippling sand dunes frozen in the Arizona rock.

This massive metal sculpture in the shape of a folded paper airplane overlooks a Utah mountain.

Water flowed out of the town's unusual tree stump fountain in the 1930s, and the well still runs today.

This Rococo church is known as the most beautiful village church in the world, and does not disappoint.

Repurposed space and ultra-modern construction collide to create this geometric wooden spectacle.

This medieval castle was painted pink as part of a now-abandoned children's theme park.