The rocks in this arid basin leave trails of movement behind them.

The seamy, underground secrets of Portland's criminal past.

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

The perfectly preserved underground rooms where Churchill plotted the war against Germany.

A tiny theater hidden in an alley plays a constant stream of short silent films for anyone willing to peer through the peephole.

A toxic ghost town sitting atop a massive coal fire.

The United States Capitol's former columns still stand.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

One man has carved a number of natural New Mexico caves into psychedelic sandstone temples.

Hot springs monkey spa in the middle of Hell's Valley.

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

The intricate stonework of Machu Picchu serves as a testament to Incan engineers.

The fairy tale castle of the "fairy-tale king."

New York's oldest magic store.

Try not to get slimed in Tribeca.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

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

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

The legendary building that needed ghostly approval before being built.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

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

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

An exquisite tunnel of cascading flowers.