The scuba diving training facility was named for the steam that rises from the cave's chimney.

The inspiration for H.P. Lovecraft's horror stories and Batman's Arkham Asylum is now a condominium complex.

A look into the Church of Scientology's deeply unfavorable view of psychiatry.

If drivers cross the rumble strip on this stretch of Route 66 at just the right speed it plays "America the Beautiful."

At this Denver landmark, the meals are compulsory, the sopapillas are complimentary, and the insanity is everywhere.

One of the dwarven trees dates back to 1625 and survived the Hiroshima bombing.

The "Seinfeld" diner.

A modernist landscape of water and sci-fi concrete.

Odd outsider art installations surround a Gold Rush-era ghost town.

The only rotating bar in New Orleans has been slowly spinning since 1949.

Ride the subways of yesteryear.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

Hollowed out cedar log tubs set in an ancient towering forest.

This little museum is built on a theater that was once a wildly elaborate speakeasy.

An abandoned facility that has become a place of ritualistic satanic worship, or so rumor has it.

Crypt mausoleum in cathedral's basement contains relics of third century Roman martyr, Saint Vibiana.

Under a glass sidewalk lie the remains of some of Manhattan's oldest buildings.

Home to items never before seen by the public.

A museum befitting the city responsible for supplying the majority of the world's LSD.

Possibly the most beautiful carillon in the world, set atop Iron Mountain in Florida.

A Pythagorean funhouse that tries, successfully, to prove that math is the coolest thing ever.

Where manatees are the snowbird vacationers in these balmy Florida springs.

Its buzzing collection honors vibrator history.

A lush green oasis in the middle of Chicago.