This large cave is a summer home to thousands of bats and has a rich history dating back to prehistoric times.

The U.S. Supreme Court's secret Cold War relocation facility in the mountains of North Carolina.

This restaurant serves wood-fired fare served in a natural cave with a live spring.

This mountaintop refuge rehabilitates tigers, lions, bears, and more from illicit wildlife trade—and offers overnight lodging.

A propulsion engine testbed that paved the way for the Space Shuttle launch sits without recognition at this rocket center.

It may look like no more than a full-scale model, but every part of this full Space Shuttle stack had a working role in aviation history.

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

This sinkhole in the Arizona desert is filled with carbonated, arsenic-rich water

The former home of the army detachment that captured Geronimo.

The lobby of this hotel near the U.S.-Mexico border features a stained-glass mural that measures 42 feet long and 6 feet tall.

This fireplace-turned-monument pays tribute to the assassinated U.S. president.

After a short-lived attempt to bring America in line with the rest of the world, this road was left in metric.

Step past the gas pumps and into a fine French bistro.

North Carolina's finest examples of Native American pictographs have survived for 5,000 years.

The world's largest fire hydrant is supposedly tornado-proof.

This titanic steel chain linking two buildings was installed without permission but instantly beloved.

Classy up your Big Mac with bow-tied servers and chandeliers at the world's fanciest McDonald's.

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

The centerpiece of the Delta Blues Museum is a wooden sharecropper’s cabin that once housed a titan of blues music.

At 207 feet, one of the world's longest continuous escalators.

A melancholy guardian doubles as a judicious godmother to this small town cemetery.

A strenuous, unofficial trail leads to spectacular views in one of America's most remote national monuments.

The world's only teal arches exist in a city that cares more about its aesthetic than an Instagram influencer.

A monument to the one-armed geologist who led the first documented expeditions through the Grand Canyon.