The feral felines of Roosevelt Island have a small army of allies and an abandoned hospital all to themselves.

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

New York's oldest magic store.

Manhattan’s Battery Park has a whimsical carousel full of spinning, glowing fish.

Home to the largest urban bat colony in North America, estimated at 1.5 million bats.

This unique structure in suburban Austin is made up entirely of other people's castaways, and constantly changing.

Continuing the tradition of the dime museum in style.

During the Industrial Revolution this “Temple of Invention” was full of intricate miniature machines and gadgets.

This vast kitty-themed collection illustrates the history of human-cat interaction.

Bigfoot prints, Feejee mermaids, and haunted dolls on display in a tiny North Carolina town.

Tokyo’s only Vaudeville-cuckoo clock–steampunk-Victorian curio cabinet time piece.

The sound of swaying stalks in this stunning grove has been named a governmentally recognized sound.

The real life Hobbiton, this sheep farm has been forever transformed since being built for The Hobbit film series.

Famously misunderstood wonder of the ancient world

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

A layered tribute to the work of mosaicist Isaiah Zagar.

A theme park that suffered massive flooding during Katrina was abandoned, and now proves irresistible to trespassing explorers.

Kings Cross Station pays tribute to its role in Britain's best-selling book series.

France's most famous cemetery, with some of its most curious tombs.

These old stone ruins in the Oregon wilderness were once bathrooms and are steeped in legends of murder.

The only structure left with direct ties to the Salem witchcraft trials of 1692.

An old vending machine serves up unpredictable beverages from its seemingly magical insides.

A roaring, awe-inspiring double cascade of icy water flows through woodland Oregon like something out of a Tolkien novel.

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