A haunted hot springs hotel that went from healing retreat to asylum before it was restored.

A historic estate packed with George Washington's heirlooms, and its own nuclear bunker.

A former utopian healing center created by a huckster and built by derelicts.

The summer home of the largest colony of bats in the world.

Wall to wall taxidermy at Denver's oldest and most exotic steakhouse.

This church in Pittsburgh is home to the largest collection of religious relics in North America.

One of the most unusual geological features, recognizable from a dozen hit movies.

The ruins of a Massachusetts prison farm can still be found crumbling the woods of a state park.

The headquarters of the Fraternitas Rosae Crucis, complete with Rosicrucian pyramids, all in the Pennsylvania woods.

Just your average Marie Antoinette–themed speakeasy in an abandoned 19th-century subway tunnel.

The world's only known button museum.

A historic bridge with a lovely acoustic anomaly.

Hordes of precariously balanced stone figures crowd the shores of the Hudson River.

An archival collection of over 2,200 case studies which includes human brain specimens and tumor specimens.

An immersive art experience built by local arts collaborative, Factory Obscura, in the building formerly known as The Womb, a psychedelic arts center founded by the frontman of the Flaming Lips.

See six states, pickled freaks, rocks, and antiques.

An experimental, automotive replica of Stonehenge.

This long, dark tunnel is open to hikers, but those without lights are known to get confused even on the straight path.

The quiet canyon has a tumultuous history involving a doomsday cult.

A historic hotel that made a cameo in Hitchcock's classic film has no intention of letting guests forget its fame.

Each of these gorgeous, intricately decorated rooms is painstakingly crafted to the scale of 1 inch: 1 foot.

The site of a 19th century "dream city" that almost rivaled Chicago before being swallowed by the Indiana sand dunes.

Beating out all other concrete competitors, this massive garden feature's pointy hat has earned it a world record.

The remote outlaw hideout of Jesse James, Butch Cassidy, and the Sundance Kid.