Former laboratory of radical psychiatrist Wilhelm Reich.

A museum dedicated to antique toys, collectibles, and nostalgia.

An abandoned gun-funded 19th century utopia.

This massive World War II calculator hearkens back to the days when "computer" was a job title.

This little brick tunnel built by Confederate forces was used to conduct surprise attacks on the railroad.

Collecting 700 years of mechanical death-dealing, the NRA's sprawling gun museum is a revealing testament to the American obsession with armament.

This plaque is dedicated to one-half of the Magliozzi brothers and their hit radio show, 'Car Talk.'

This plaque commemorates the call between Alexander Graham Bell and Thomas A. Watson.

This impressive tunnel was dug entirely by hand over the course of 36 years.

Explore 10 acres of environmental sculptures.

The eroded core of an ancient volcano is now accessible by a short hike.

This remote desert watering hole has a connection to a curious chapter of American history.

These disused steel furnaces are now haunting ruins that may one day be a national park.

Collection of trolley cars in the woods represent one man's attempt to preserve transportation history.

Towering basalt columns, a creation of fire and ice.

Graffiti, cars, and religion combine to create this jungle of scrap in the Nevada desert.

This naturally heated mountainous creek has created a group of neon blue pools of potentially deadly boiling water.

Eliot was the first missionary to produce religious text for Algonquians in their own language.

The Pennsylvania landscape depicted by a quarter mile of mosaics made from used road signs.

Buildings that dynamite couldn't bring down were abandoned because of bathroom issues.

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

The graffitied ruins stand hidden within the Pennsylvania woods.

This ruined fort hidden at the top of Central Park can't seem to keep from losing its historical plaques.

Though its celestial ceiling is impressive, the true star is the vast collection of French books.