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

A motel dedicated to Southwestern nostalgia.

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

The highest point in Washington state is a volcano covered in glaciers.

While many places make the claim, the Library of Congress says this restaurant is the birthplace of the hamburger.

One of the best places to see feral Colonial Spanish Mustangs in the United States.

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

Turnip-shaped island just off the Michigan shore in Lake Huron.

The land is home to swimming ponies and a legendary 18th-century treasure.

A new kind of theme park for adults off the Las Vegas Strip.

A WWI fighter plane and turn-of-the-century penny candy shop are among the unexpected features of this Financial District building.

Lie in a hammock where George Washington stood.

Pizza with a side of fine art.

This pebble beach is so beautiful that taking its rocks is against the law.

A (slightly) grownup take on the classic retro arcade.

Paranormal investigators claim this abandoned asylum is the most haunted spot in the eastern U.S.

Ancient pueblos built into the base of a natural canyon wall.

An ice cream parlor chain that caters to vegans and pinball fans equally.

A massive sea stack famous for its appearance in The Goonies.

Despite time, colonization, and the brutal New Mexican heat, these Pueblo ruins still stand.

Witnessing the might of this dessert-colored desert waterfall is a rare, powerful treat.

This semi-hidden Manhattan restaurant is based out of a loading dock.

Tiki luxury on Nob Hill.

One part antique store, one part curiosities hodge-podge.