Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

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

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

Sloth rehabilitation center in the jungle of Costa Rica.

A submerged village appears when dam levels drop.

Remnants of a storybook amusement park hidden behind a strip mall.

This astonishingly geometric cave has inspired everyone from Jules Verne to Pink Floyd.

The only remaining collection of flayed figures made by French "madman" Honoré Fragonard.

Behind the pink curtain, Au Bonheur du Jour, an art gallery of erotic archives.

A seemingly endless landscape of pure salt stretches far across Bolivia.

A madman's personal garden filled with 1,000 sculpted heads.

Budapest's Communist-era statues, banished to the suburbs.

A local farm's collection of unusual structures from a now defunct storybook amusement park.

Surreal riveted sea forts once protected the Kent shores from German attack.

The final resting place of the poets Shelley and Keats.

San Francisco Bay's ghost town.

A beautiful and classically designed villa, with an hourly infestation of monsters.

The largest known Ancient Egyptian obelisk.

Anatomical cabinet holds unexpected treasures.

Along a California highway is a kind of Jurassic Park made of metal.

A hand-built folk art installation covered with messages of God's love.

The largest collection of two headed animals in the world.

Sleepy fishing port not included on many maps.

Ancient church constructed with a special wood that preserves prints from the past.