A massive cave complex boasts some of the clearest water (and most charming bats) in the world.

The largest of London's subterranean rivers and once a mad, bad center of London life.

Shrine to Japanese water-goblins, complete with their preserved body parts.

A spectacular cave and a beguiling lake.

Nonprofit art center that promotes outsider, intuitive, and self-taught art.

The taxidermied remains of Charles Dickens' pet raven, which helped inspire one of Edgar Allan Poe's most famous poems.

This empty Victorian manse on Staten Island is said to be haunted but is actually a real life crime scene.

The loneliest island in New York.

San Francisco's urban bison herd has persisted in the face of extinction, development, and disease.

This crumbling UFO is one of only a few remaining "moveable ski chalets" of its kind.

Love, knishes, and best wishes from this legendary Lower East Side bakery.

A battle between nature and architecture in the Cambodian jungle.

Giant pinnacles in the sun-scorched lands of Southern Utah have been nicknamed "white ghosts."

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

These Pre-Columbian petroglyphs contain representations of birds, deer, hunters, and even some early Native flute players.

A beautiful bamboo trail tucked in this famous Japanese Shrine.

The man who first patented the Ouija board rests in peace beneath a headstone that playfully reflects that achievement.

Keshwa chaca, among the last handwoven Incan bridges, crosses Apurimac Canyon in Peru.

The final resting place of the great escape artist, where some still gather to wait for his escape from death.

Half of a waterfall goes into the river while the other half seems to disappear.

After a profound show of devotion for his master, a dog becomes the symbol of loyalty for an entire nation.

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

A collection of full-size movie monsters opened to the public.

This brightly made over hotel hides decades of suicide, serial killers, and mysterious deaths.