This geothermal hot spring hides beneath a slowly growing mineral dome.

One of the world's oldest and most massive living organisms is a grove of quaking aspens.

Here, at the "world's longest art gallery," you'll find forty miles of ancient petroglyphs and pictographs.

A house carved into a rock in the 1940s.

The widow of Benjamin Franklin's brother became the first female newspaper editor in the United States.

The only surviving fragment of the lost Narragansett Pier Casino.

An ancient cemetery with some historic bodies underfoot.

A railroad magnate's replica village has become home to a genetic seed bank for rare breeds of livestock.

Abandoned Coast Artillery fort now serves as graffiti canvas and sightseeing vantage point.

A crumbling stone stable and carriage house are all that remain of a manse that was once filled with Egyptian artifacts.

The exact whereabouts of this surreal cabinet of curiosities are rarely the same place twice.

This abandoned Poconos resort is haunted by a history of kitschy romance and a violent fugitive.

"Dark Sky Park" is heaven on Earth for astronomers, one of the rare U.S. locations with no artificial light pollution.

A beautiful oddities shop crammed with strange and morbid curiosities.

Sail through this subterranean show cave that is home to a legend that would go on to name nearly everything around it.

An abandoned stretch of highway, deteriorating next to the operational one.

Frank Lloyd Wright's most iconic home dangles over a Pennsylvania waterfall.

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

Who needs fancy modern water slides when this giant North Carolina rock works just as well?

This derelict building used to house infirm Freemasons, their widows, and orphans.

The saddest little diner in New York.

This abandoned factory on the Hudson River once churned out a million bricks a week.

Abandoned 19th century homes once occupied by naval officers, soon to be demolished.

This once luxurious Catskills resort is now a haunting ruin.