A geological mystery on Camelback Mountain.

An old saloon in the West filled with history, and according to some, a few dozen ghosts.

A wild west cemetery in Tombstone, Arizona, provides a window into the Old West.

Limestone caves with spectacular showcase chambers.

What is the Thing?

A mining town once rife with murderous disputes over its copious treasures now creates income as a popular spot for photo shoots.

A monument to the egos of two railroad magnates that fell into decline along with their careers.

The high point on the 16th president's eponymous roadway is marked by a massive version of his head.

The first declared National Monument in the United States.

The granddaddy of all tourist traps, built on ice water, jackalopes, and a giant dinosaur.

The world's largest mountain carving could fit all of Mount Rushmore inside it many times over.

The longest navigable underground river in the United States is home to countless blind and albino animals.

This public square capitalized on a single Eagles reference to bring some life back to an Arizona town.

This 4,000-foot-diameter hole is touted as "the most well known, best preserved meteorite crater on Earth."

Ancient pueblos built into the base of a natural canyon wall.

"Only the devil could play golf here."

The lowest point in North America is home to an undrinkable pool surrounded by fields of geometric salt flats.

The second-largest gold nugget in existence, displayed in a Las Vegas casino conveniently named the Golden Nugget.

Odd outsider art installations surround a Gold Rush-era ghost town.

An eatery for UFO seekers on the Extraterrestrial Highway.

Stepping away from the glitz of mobsters and casinos to learn about the other history of Vegas.

This incredible collection of vintage pinball machines can be played at 25 cents a pop.

The bullet-riddled wall from the St. Valentine's Day Massacre, bloodstains enhanced for your viewing pleasure.

Dyed by iron oxide over centuries, these sandstone rocks rise thousands of feet into the sky.