A collision of human error and natural geothermal pressure created this rainbow-colored geologic wonder.

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

The neon signs from Las Vegas' past find their final resting place at this unusual graveyard.

A tiny museum housed in a New York freight elevator specializes in the "overlooked, dismissed, or ignored."

An artsy hidden staircase leads to breathtaking views of San Francisco.

Non-profit time travel mart sells goods you would need for a trip through the fourth dimension.

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

Eighteen miniature death-scene dioramas.

Giant Redwood-themed cafeteria operates under the golden rule, "Dine Free Unless Delighted."

In all of the 29 years it was in operation, no prisoners ever escaped successfully... or so they claim.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

On the Oregon coast there is a natural hole that seems to be draining the sea.

World's largest collection of serial killer artwork and other macabre exhibits.

A huge musical instrument played by the ocean.

An antiquated German apothecary on Chicago's North Side.

Former hotel turned into haunted playground.

A century-old hotspot for jazz, frequented by everyone from Charlie Chaplin to Al Capone.

This sprawling mini-golf empire is an impressive testament to a disappearing attraction.

An art deco ice cream shop covered in vintage train station tiles.

This burger joint is named after everyone's favorite carnival prize and is adorned with a giant one over the door.

This spectacular public market has got meat, fish, vegetables, baked goods, and enough kielbasa for a lifetime.

Funded by John D. Rockefeller, this is one of the earliest, and most beautiful, shopping arcades in America.

Lyon, France is home to two remarkably preserved Roman theaters, one dating back to 15 BCE.

A remarkable time capsule of American manufacturing deep in Maryland coal country.