These ruins of a pre-Columbian cliff village are among the most beautiful and well preserved in New Mexico.

Twice a year, visitors can tour the desolate site that birthed the Atomic Age.

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

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

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

A legal loophole makes it possible to get away with murder within this 50-square-mile section of Yellowstone.

The ruins of a town wiped out by the second-largest earthquake in recorded history.

Running under an entire mountain, the longest highway tunnel in North America is kept fresh using portal fans and jet fans.

This small city where almost everyone lives in the same building can only be reached via North America's longest tunnel.

America's smallest town is run by its single citizen/mayor/librarian/bartender.

In the middle of the desert, miles from any human life, sat an anomalous pay phone that still magically answers your calls.

The face of a woman pushes its way through the earth.

The sign to a demolished amusement park now stands in front of a local library.

This rickety old shed hides a trove of secondhand literary treasures.

A monument commemorating the role of Alaska's native Tlingit guides in the Klondike Gold Rush.

A rock maze opens up to a panoramic viewpoint at an abandoned mine full of ghost stories.

An American flag was erected for every day that passed during the Iranian Hostage Crisis.

Each step is a mere four inches tall, said to be measured by the stride of a woman wearing a hobble skirt.

The Cold War-era "underground Pentagon" is a sprawling subterranean hideaway for the Defense Department.

The final resting place of two members of the infamous Doan gang, notorious outlaws and Revolutionary War Loyalists.

Once the most painted on object in the world, this short campus fence is well on its way to being so again.

The famous bell was secreted away and hidden in a church in Allentown during the British occupation of Philadelphia.

North America’s largest collection of horological devices and home to a colossal clock with a dizzying array of features.