Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

A walk through the historic city center, under the streets of Seattle.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

Dodge prohibitionists and slide through the telephone booth in Crif Dogs.

James Turrell's total color immersion art installation, hidden on the top floor of a luxury handbag shop.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

An eerie, derelict amusement park in Berlin.

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."

A peculiar mansion built by the troubled heir to the Winchester Rifle Company fortune.

A huge musical instrument played by the ocean.

270 million year-old forest of stone.

Not one, not two, but three natural bridges remain in this captivating spot post-sinkhole.

The latest in a series of long glass bridges suspended at terrifying heights.

Mirrored floors and arched shelves create the illusion of an infinite tunnel of books.

Why walk on this historical site when you can zoom down instead?

For those with no fear of heights: a skywalk 4,700 feet up on a Chinese mountain.

This psychedelic tourist trap is a leisurely descent into madness.

A canvas of crops grow from vibrant red soil in this terraced farmland.

These layered sandstone mountains in China look like they are made of pressed crayons.

This abandoned fishing settlement may well be the greenest village in the world.

This vertical pinnacle in China was the inspiration for the floating mountains in the movie “Avatar.”

A part of the world's largest marsh seems to be growing bright red Martian grass.

A fifth-century temple improbably built into the side of a cliff.