An unfortunate geological resemblance to Satan has labeled this Pasadena gorge as a passage to the underworld.

This giant temperature attraction created some giant electric bills.

A coal fire has been burning underground here since 1896.

This statue of an obscure comic strip hero stands as a tribute to patriotic service and a cautionary tale about embracing fads.

An impressive collection of over 50,000 minerals including moon rock from the Apollo 17 mission.

A beautiful combination of living flora with preserved bones covers the shelves of this shop.

The Denver airport is guarded by a 32-foot-tall sculpture of a demonic horse.

When ecosystems collide in the arid Southwest.

A museum dedicated to the legacy of Bob Moog and his pioneering synthesizers.

This North Carolina museum is keeping the pinball craze alive, with a little Space Invaders on the side.

This rare basilica nestled right in downtown Asheville is an architectural marvel, inside and out.

Frank Lloyd Wright died a year before construction on his largest public project even began.

A working model of the entire San Francisco Bay and much of the Sacramento River Delta, complete with regular tides that change every 14 minutes.

Inside an old airplane hangar, friends and strangers alike play on a massive trampoline.

A century and a half of research in the sciences and natural history, still going strong.

Inside this museum, the history of the Walt Disney Family empire is on full display.

Where a staggering 747 ships were constructed during World War II.

The last remaining relic of San Francisco's glittering 1915 Panama Pacific Exposition.

9,000 square feet of vintage and modern mechanical toys, dioramas & sideshow curiosities.

This private residence was the template for one of the most beloved television homes of all time.

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

A modern mechanical planetary system, part of a 10,000 year clock.

A collection of 20th-century automata, penny arcade games, and musical contraptions.

A shop full of natural curiosities, carnivorous plants, and costumed taxidermied mice.