Elevated freight railway turned wildly successful urban park.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

For two weeks every June, fireflies in the Smoky Mountains perform an astonishing light show.

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

This dramatic landscape hidden on the Isle of Skye looks as though you've stepped into the magical realm.

A bizarre house filled with an astounding array of collections.

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.

This churchyard arbor is surrounded by hundreds of gravestones placed there by author Thomas Hardy.

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

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

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

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

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.

These fantastically named natural pools look like something out of a Scottish myth.

Dramatic river bend surrounds a natural red-rocked pedestal.

On Japan's Tashirojima Island, cats are king.

Wondrous sandstone hoodoos where Native Americans collected clay for pottery, 9,000 years ago.

An enormous, inside-out glass globe built in 1935.

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

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

An eerie, derelict amusement park in Berlin.