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

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

Elevated freight railway turned wildly successful urban park.

Try not to get slimed in Tribeca.

The ghostly remains of an accidental sea.

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

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

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

High on a hill overlooking Los Angeles lives a world famous, high power conical Tesla Coil.

Medicinal spa created with the discharge from a geothermal energy plant.

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

A crumbling hospital from the 1850s on Roosevelt Island.

Bring your own cardboard to the slippery slopes of concrete hidden in a neighborhood park.

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

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

A huge musical instrument played by the ocean.

A nondescript building that's been functioning as a speakeasy for nearly a century and a half.