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

Sandstone rock formations that look like they belong on the cover of a progressive rock album.

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

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

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.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

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

This huge dam across the Colorado River caused an armed standoff between two U.S. states.

The Jewish section of the famous Boothill Graveyard was abandoned for nearly 100 years.

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

The largest copper mine in Arizona, this enormous open pit emerges from the hills like an alien landscape.

The lost ruins of the forgotten ferry lie hidden beneath the silt.

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

The eroded core of an ancient volcano is now accessible by a short hike.

More than 300 years ago, a revolt at this Hopi pueblo shaped the future of the American Southwest.

A partial tunnel blasted into a steep ridge is all that remains of a failed railway across Arizona.

A nature and cultural preserve named for its multitude of petroglyphs carved by the Northern Sinagua people.

This reclusive Hopi village in Arizona has been continuously populated longer than anywhere else in America.

A secret fresh water spring for animals and humans alike hidden along the most famous road in the United States.

The wreckage of a deadly bomber plane crash can still be found near an Arizona peak.

Witnessing the might of this dessert-colored desert waterfall is a rare, powerful treat.

The highest point in Arizona is an oddly snow-topped peak within the otherwise arid state.

This southwestern historic site was designed and built by an artist who wanted his work to "feel at home."

A mysterious spirit totem at the edge of Navajo lands.