The sign at the garden gate reads: "These Plants Can Kill."

Two stunning 17th-century libraries and a cabinet of curiosities.

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

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

This whimsical Oz-themed park had a wonderful impact on the surrounding neighborhood.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

New York's oldest magic store.

This collection of illusory paraphernalia has been culled from the history of London's premier magician's club.

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.

The walls are decorated with whimsical murals painted by the creator of the Madeline franchise.

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

Unique antiquarian shop specializing in globes, maps, and prints.

148 feet long and in the middle of a verdant forest.

A hollow cement depiction of time's inexorable effect on the human body.

Peruse rare tomes like poetry bound in pearls or books with branches and berries growing out of their spines.

These beautiful ruins deep in the Pennsylvania woods are thought to have been a ski lodge or a speakeasy, but no one really knows.

Ralph Waldo Emerson spent two years living here decades before it became a Frederick Law Olmsted-designed park.

This lake in the Cascades lives up to its name, disappearing down a hole every spring.

This Florida sinkhole hides a rainforest-like micro-environment in its depths.

Canyon walls shrouded in ferns.

The one-time watch house for incoming ships at the Golden Gate now stands abandoned and hidden in trees.

A spiritual retreat in the heart of Los Angeles offers stunning gardens and a labyrinth to lose yourself in.