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

A tour of underground Berlin takes you through WWII air raid shelters and tunnels used to smuggle people out of East Germany.

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

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.

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

A layered tribute to the work of mosaicist Isaiah Zagar.

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

France's most famous cemetery, with some of its most curious tombs.

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

The world's only museum devoted to the wonders of fluorescence.

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

A bizarre house filled with an astounding array of collections.

This shop and gallery is a modern-day cabinet of curiosities, unassumingly positioned along an urban thoroughfare.

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

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

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

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

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.

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

Dramatic river bend surrounds a natural red-rocked pedestal.

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

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