The history of the treatment of mental illness, illustrated in all its gory detail, and housed in an asylum.

A Texas-sized particle collider that was abandoned due to its Texas-sized budget.

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

A luxurious 1880s hotel with its fair share of Tiffany stained glass, Edison electricity, and of course, ghosts.

This Oregon farm is dedicated to teaching people the professional art of tree climbing.

A cave's rare beauty held a cavernous secret hidden underground.

Bad farming practices caused this unnatural natural wonder.

A lovely aquatic park built by a one-armed Civil War veteran who made a fortune from lotuses.

This large midwestern cavern features impressive rock formations and an underground waterfall.

A popular tourist cave with a dark past.

One man has installed bathtubs into the Utah desert floor to harness the powers of a natural hot spring.

These sub-farmland caves are home to a majestic stalactite known as the "Crystal King."

A medical facility that has been kept frozen in time.

An ice cream parlor chain that caters to vegans and pinball fans equally.

A tribute to Ponce de Leon's supposed quest for eternal youth.

Mile-long cave system near Great Smoky Mountains.

This museum celebrating the almighty dollar lets visitors literally stand in the shadow of a million bucks.

Their motto is, "We've been bonkers for hats even longer than you have!"

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

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

This fast-food outlet is the only space and UFO-themed McDonalds in the world.

A historic covered bridge, only one of two remaining in North Carolina.

This rare example of a "tidefall" is a spectacular drop from the cliffs down onto the beach.

They call this long foot bridge a swinging bridge, but really it's the bouncing you have to watch out for.