This stately structure has been abandoned for half a century.

The strange phenomenon causing gravity to "work backwards" on this hill has been blamed on the paranormal.

A landscape of massive spherical boulders are the main attraction in this Kansas State Park.

Remnants of the rich history of fish salting in this ancient Mediterranean port town.

This ancient rock painting is the oldest evidence of humans’ love affair with honey.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

A sculpture made of 10 Cadillacs as a monument to the "Golden Age" of the American automobile.

A pair of slides and a tree-lined stair corridor have been an urban oasis for nearly 40 years.

A garden oasis filled with flowers mentioned in the works of William Shakespeare.

An unlikely Transcendental Meditation haven in the American Heartland built around the ancient Vedic principles of balance and harmony.

A museum dedicated to the quirky and colorful world created by Springfield's favorite son.

This abandoned psychiatric hospital once housed more than 4,000 patients in the middle of a quaint New England town.

An abandoned Cold War missile radar site.

Junkbots and mud babies are the masterpieces in this fantastically sci-fi art museum.

The remains of a deserted steamboat sit rusting beside an old ferry pier and an abandoned train platform.

Where the polar bear watches over everything, and every drink is a double.

A huge collection of rocks, gems, and crystals.

A mesmerizing disco ball-like sculpture along the Sacramento River Walk.

Home to one of the world’s largest collections of model yachts.

An elaborate gift from Claus Spreckels is now a piece of San Francisco history.

Radioactivity still cause for concern at this urban explorer's paradise.

An essential stop before plundering, BYO Cutlass.

The oldest burial ground in the city, final resting place of city founders, Ohlone natives and murderers alike.

The seawater playground of gilded-era San Francisco burned to the ground in 1966.