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

A layered tribute to the work of mosaicist Isaiah Zagar.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

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

Crystal clear lake with a shoreline of travertine located in a Colorado canyon.

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

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

The legendary building that needed ghostly approval before being built.

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

A bizarre house filled with an astounding array of collections.

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

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.

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

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

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

This beautiful building in the heart of Manhattan's Financial District was empty for decades.

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.

Dramatic river bend surrounds a natural red-rocked pedestal.

Amid the bustle and noise of the Financial District hides a secluded garden oasis above the city streets.

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

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

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