An off-the-beaten path cave with an underground lake.

The remains of this rugged homestead ranch offer a brief glimpse into a bygone era.

A once popular resort—said to be the vacation spot of gangster Al Capone—now remains abandoned in the woods of Arizona.

The remote resting place of a notorious Wild West outlaw whose death is shrouded in mystery.

This 40-room dwelling tucked within a cliff was built by the basin's prehistoric residents.

An artificial crater field that trained astronauts for lunar exploration.

An arsenic-filled pool in the Grand Canyon takes on the appearance of a giant, overflowing pumpkin.

Rippling sand dunes frozen in the Arizona rock.

This collection honors the iconic, and proudly American lighter that just won't quit.

The secluded site of a 1943 plane crash and amazing rescue is only accessible by hiking through the woods.

A few dilapidated structures are all that remain of this deserted former silver mining town.

Natural rock water slides hidden in the remote forests of northern Idaho.

A giant time capsule not scheduled to be cored until 2040.

A glowing underwater cliff attracts marine life and divers in equal measure.

Send a postcard while vacationing with Satan.

A massive tribute to this small county's top agricultural product.

In this case, 'zero' marks the spot where the iconic Old Spanish Trail ends.

This naturally-sourced hot spring is now home to a clothing-optional resort.

The scene of one of the darkest moments in American labor history has been left essentially untouched since the tragedy.

The highest point in Texas is capped by a big silver pyramid.

Vintage cars and motorcycles race for glory in a throwback motorsport celebration on the Jersey shore.

The United States Capitol's former columns still stand.

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

See just what life was like in a 19th-century prospecting town.