An ancient Egyptian temple in the middle of Madrid, Spain.

The vast, legendary catacombs hold secrets much stranger than stacked bones.

Spectacular 300-foot cliffs in a lush mountain canyon.

The oldest continuously occupied public building in the United States.

A saloon and inn that served the Wild West's most iconic figures—and is still haunted by some of them today.

The winter home of thousands of beautiful snow geese and sandhill cranes.

Thousands of pieces of art have been carved into the rock at the site of an ancient volcanic eruption.

A museum devoted entirely to the rattlesnakes and snake-related art.

This volcano rises like a giant anthill from the plains below, with a road spiraling up to the rim.

The official atomic museum of the United States explores the explosive and productive history of a much maligned energy source.

A multi-storied adobe complex has been inhabited for more than a thousand years.

Eat like pre-Columbian Native Americans in this New Mexico restaurant within the Indian Pueblo Cultural Center.

A clear blue swimming hole with hidden caves, still unexplored.

A museum dedicated to the alleged Roswell Incident.

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

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

A roadside attraction filled with an astounding array of gloriously wacky vehicles.

This "zoo" is a cross between a junkyard and a sculpture garden, featuring animals you won't see anywhere else.

This vintage theme park is peak Christmas kitsch—and it's open all summer.

One of the oldest continuously operating amusement parks in the U.S. is an open-air museum of Art Deco and neon lights.

No one knows exactly how deep the world’s deepest geothermal hot spring is.

This small piece of railroad history sits behind the parking lot of a chain grocery store.

See 150 million-year-old dinosaur tracks and bones dating back to the Jurassic period.

A focal point of in Denver’s skyline for over a century, inspired by a Venetian basilica.