A new kind of theme park for adults off the Las Vegas Strip.

The only bridge in the United States where BASE jumping is legal without a permit year-round.

This underground cave located in the most barren reaches of Idaho is filled with ice year-round.

These falls, sometimes called the "Niagara of the West," still put on a good show at the right time of year.

This trail leads to a mine that was used as a sanctuary during the Great Fire of 1910.

Jail from the 19th century that was built by inmates.

A wild west land agreement was etched right onto this historic Idaho stone.

This Old West hotel, the longest in continuous operation in the state of Arizona, is claimed to be haunted.

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

An amazing collection of model trains, collectibles, and artifacts that span the last 100 years.

A museum and tribute to a brave profession.

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

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

The largest natural travertine bridge in the world is nestled in a small canyon in central Arizona.

Thousands of Mexican Free-Tailed Bats soar around an abandoned storm drain at sunset each summer.

A self-built castle made by a mysterious man.

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.

This remote camping site offers incredible stargazing opportunities.

A waterfall and cave near Arroyo Seco that inspired the writings of D. H. Lawrence, Willa Cather, and Mabel Dodge Luhan.

A frozen oasis lies beneath the scorching New Mexico desert.

When ecosystems collide in the arid Southwest.

This naturally-sourced hot spring is now home to a clothing-optional resort.

Paranormal experiences in this hotel's room 217 led Stephen King to write "The Shining."