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

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

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

It should come as no surprise that the best view of the Hollywood sign is from Batman's lair.

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

Tucked in the back of this amazing antique store is an important piece of medical history.

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

A bizarre house filled with an astounding array of collections.

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

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

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

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

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

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

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.

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

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.

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

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

The mysterious, fantastical woodland inspiration for "The Lord of the Rings."