The largest hot spring in the United States is, as the name suggests, a stunning show of natural color.

The first declared National Monument in the United States.

These crudely shaped folk giants may be the the second most photographed statues in the U.S.

Hiding the longest subterranean river known in the world.

An industrial relic is now one of Europe's most staggering art spaces.

This ghost town in Belgium will lose its street art when it ceases to exist.

Most prolific publishing house in the 1600s open to the public.

A little sculpture with a large wardrobe.

Delightful disarray of found objects and clutter.

Hoodoos, naturally eroded land formations, stand 20 feet tall in the Canadian badlands.

A heavenly experience, right here on Terra Firma.

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

100-year-old shipwreck you can walk up to at low tide.

Town of spiritualists and mediums in Florida.

Possibly the world’s easiest Easter-egg hunt.

Infamous marsh filled with toxic waste, World War II-era London rubble, and dead mobsters galore.

World's largest herd of white deer populate a former U.S. Army depot.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

A monument to the center of the North American continent may be off by a few miles.

Electrical pylon in the shape of Disney's beloved mouse.

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

A unusual sanctuary for abused and exotic animals in South Jersey.

The world's longest known cave system.

A toxic ghost town sitting atop a massive coal fire.