Two geoglyphs that are truly unique to North America.

Formerly frequented by Hollywood stars and now open for tours.

This once-booming Gold Rush town is now home to a herd of feral donkeys.

An abandoned quicksilver mining town surrounded by the Big Bend parks.

Mysterious glowing orbs float through the desert night.

A Prada store in the West Texas desert that is never open for business.

The second-largest cave chamber in the world was discovered in 1898 by a 16-year-old and a friend known as "Pothead."

The state bird of New Mexico, constructed entirely out of garbage.

The outcropping is graffitied with the name of the beloved musical Muppet television series.

Steep canyon walls hide a forested oasis in the West Texas desert.

This quirky outpost and gallery inside a former church is an unexpected trove of handcrafted art.

A little stop along the Texas highway where Rock Hudson, Elizabeth Taylor, and James Dean stayed while shooting the 1955 film "Giant."

This old abandoned sign flickers to announce a motel that isn't even there.

A spring-fed pool so deep it's used for scuba diving as well as swimming.

An old railroad grade built for the construction of Hoover Dam is now a recreational trail featuring several tunnels and sweeping views of Lake Mead.

Experience a charming 1930's version of "infotainment."

A Norwegian-born sculptor created these soaring guardian angels at the entrance to Hoover Dam.

These markers are used to document elevation changes around the famed dam.

Beehive charcoal kilns and slag deposits mark this late 19th century camp centered on a smelter.

Visitors to this arboretum are greeted by three smiling giants crafted from sustainable materials.

So many migrating birds roost on the bridge, it has a special summer speed limit.

The world's longest known cave system.

An idyllic mineral hot springs facility with a more-than checkered past.

Enormous lake at the bottom of a unique cave system.