One of the Cemestos prefab homes built to secretly house thousands of Manhattan Project workers.

One man has spent decades faithfully constructing this unique brick and cinderblock castle.

Elvis's own personal tropical hideaway.

All you ever needed or wanted to know about America's favorite whiskey, but not a drop to drink.

Better known as the "Body Farm," this unique research facility has been studying how human bodies break down since the 1980s.

Enormous lake at the bottom of a unique cave system.

Outstanding collection of 19th century medical instruments includes a life-size figure cast from as many as 200 cadavers.

A ship that lived many lives under many names is now known merely as the "Ghost Ship."

One of the few surviving "Wigwam"-themed motels.

The world's longest known cave system.

This former tuberculosis research hospital endeavored to cure the dreaded disease with fresh air and positive attitudes.

Prehistoric animals decorate this popular outdoor park.

Memorials and tributes scattered across the university grounds remember a famous national tragedy of the Nixon era.

You can walk through the first Boeing Air Force One, which famously carried JFK's casket from Dallas back to D.C.

A retro walk through the history of the tube.

An abandoned asylum incorporated into a college campus.

This abandoned bridge to nowhere stands secluded in the woods of a Cleveland suburb.

An opulent testament to the boom-and-bust history of industry in north central Indiana.

The chiseled jaw of this forgotten American hero still stands tall in a small Indiana town.

Historians and hobbyists head to this former French outpost for the annual Feast of the Hunters' Moon.

One tree's homage to soles past and present.

Part of a worldwide art project, this mysterious semicircle of concrete shapes holds the pieces of a larger story.

Covered in tens of thousands of coats of paint, this Indiana attraction holds a world record all its own.

This open air cathedral invites all faiths to worship under the only roof big enough to fit them all: the sky.