Get lost in this haunting fairytale art walk through a man-made eucalyptus grove.

Stroll through a wonderland of stupendous moss-covered trees.

The only theatre in the world constructed specifically for sound movement.

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

The only swimming pool listed on the National Register of Historic Places is emptied and refilled each day with naturally filtered water.

The haunting "Hell House Altar" is one of the few remnants of an abandoned college that has been a magnet for local legends.

Enormous lake at the bottom of a unique cave system.

A toxic ghost town sitting atop a massive coal fire.

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

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

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

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.

A bizarre house filled with an astounding array of collections.

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

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

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

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

An abandoned cemetery lies in ruins as the surrounding forest swallows it whole.

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

A treasure trove of artifacts, books, and artwork from the "golden age" of exploration.

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

A crumbling hospital from the 1850s on Roosevelt Island.

Rippling sand dunes frozen in the Arizona rock.