The world's largest man-made underground caverns offer unparalleled underwater wonders.

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

Once an ambitious nature spa, these forest ruins now provide a serene monument to failure.

European castle ruins in an American state park are actually the product of death and grief.

A rainbow-colored house promotes LGBTQ rights across the street from the Westboro Baptist Church.

A house turned museum is the real-life "home" of the fictional main character of The Wizard of Oz.

Step back in time at this 1950s display home, built to showcase once cutting-edge electric amenities.

Marking the spot where a conquistador gave up his search for the fabled Seven Cities of Gold.

Massive still life just off the highway in Kansas.

Self-built house and sculpture park where the creator can still be seen in a glass coffin.

This spiny beast guards an artist's village while vying for the title of largest lobster in the world.

The so-called "world's shortest river" is actually a window into a cave.

The behemoth beasts engaged in an epic battle is the second-tallest statue in the contiguous United States.

The snowbirds here are circus sideshow performers.

An 18th-century Spanish watchtower made entirely of seashell and concrete.

This kitsch eatery is chock-a-block with bric-a-brac.

Where monkeys run wild and the humans are caged.

One of many gator theme parks, abandoned in the sugar fields of South Florida.

In Florida, these naughty monkeys live on their own mini-monkey Alcatraz.

Florida castle built with aluminum printing plates.

This ancient sinkhole-turned-healing-pool is a treasure trove of archeological discoveries and may even be the Fountain of Youth.

This ancient octopus-like tree was saved from destruction thanks to shady reporting.

An oddities shop that dabbles in the deathly and beautiful.

Japanese gardens dedicated to the Japanese farmer that refused to throw in the trowel.