A 16th-century horror show built in a lovely Italian garden.

This Venice bookstore has resigned itself to constant flooding by keeping its books in bathtubs and boats.

The remains of a failed attempt at medieval nerdery are hidden deep in the woods of Virginia.

Hot springs monkey spa in the middle of Hell's Valley.

A taste of the macabre Tokyo's ritzy shopping district.

Enormous lake at the bottom of a unique cave system.

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

Under the right circumstances, this waterfall in Yosemite briefly turns a luminescent fiery orange.

Explore the largest pure gypsum deposit in the world, and go dune sledding while you're at it.

An Italian crevasse filled with abandoned buildings gives visitors a look at the world without humans.

This lower Manhattan bar is set up in an old bank vault that rests beneath a skyscraper that hides even more historic splendor.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

The abandoned zoo enclosures offer a perfect place to experience the other side of the bars.

A bizarre house filled with an astounding array of collections.

Abandoned railway line circling the city of Paris.

This abandoned subway station beneath the Waldorf-Astoria hotel is allegedly used to secretly transport presidents.

Dramatic river bend surrounds a natural red-rocked pedestal.

This jaw-dropping 19th-century bridge uses its reflection to form what appears to be a perfect circle.

The history of occult science is turned into a creepshow at this lurid Prague tourist attraction.

The installation’s official name, “You Who Are Getting Obliterated in the Dancing Swarm of Fireflies,” says it all.

This secluded aqua waterfall in the Grand Canyon is the perfect swimming hole, and the Havasupai tribe's fiercely protected natural wonder.

The world’s oldest and biggest bookstore stocking only mystery, crime fiction, espionage, and thrillers.

An immersive environment that is part haunted house, part choose-your-own-adventure, and part jungle gym.

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