The United States Capitol's former columns still stand.

A toxic ghost town sitting atop a massive coal fire.

A one-of-a-kind collection of a unique medium.

A winding path built in secret on the edge of the continent.

America's most famous piece of self-built architecture.

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

Resting place of Hollywood's immortals is also site of summer film screenings.

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

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

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

The oldest family-run luncheonette in New York, last renovated in 1948, still serves food and drinks the old-fashioned way.

These remote Florida islands have a history of sea turtles and sunken treasures, and one of the world's largest coastal brick fortresses.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

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

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

Remants of foundations, streets, and streetcar tracks inhabit the cliffs where a landslide occurred in 1929.

A 140-year-old castle with underground caves hidden in San Francisco.

Dramatic river bend surrounds a natural red-rocked pedestal.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

An emerald-green grotto just a short trip from Austin.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

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