These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

An abandoned quicksilver mining town surrounded by the Big Bend parks.

The house's confection-like decorations are the result of one man's painstaking work over decades.

A prison-like structure guards the remains of a notorious Old West outlaw.

The ruins of this former mining boomtown once housed over 3,000 people. Now, the population is two.

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

In a largely deserted ghost town, a little brick building recalls its history as a gold rush hub and haven for outlaws.

A phenomenal assembly of pueblos in New Mexico is the most complete example of ancient ruins north of the border.

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

Seemingly grown on some other world, these New Mexico rock formations look like a disused science fiction set.

The land is full of geologic eye candy, such as otherworldly spires, mushroom-shaped hoodoos, and prehistoric fossils.

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

Hidden in the Chihuahuan Desert resides an amazing collection of petroglyphs.

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

Some of the Old West's most notorious outlaws frequented this mining town.

Tucked away on an empty wooded lot in suburban Oklahoma City lie the remnants of an abandoned circus camp.

A late sculptor's last project was to turn this abandoned cement factory into a castle-themed amusement park.

One man's unrequited love stands in a glass box forever.

One man's vision and a labor of love of many.

Undone by Prohibition, this abandoned brewery-turned-flour mill is now ready for its third act.

The crumbling remains of the first Black-owned and operated hospital in Kansas City.

Hiding behind a grocery store is a spectacular cavern carved as part of an old limestone quarry.

River pirates, murderous bandits, and serial killers used this Illinois cave as their debauched hideout.

A once-booming Mississippi River town with a history of racial violence is now eerie and mostly abandoned.