The Art Deco artwork depicts gilded carriers of deadly illnesses.

This enormous World War II relic is one of the largest wooden structures in the world.

An unassuming London park is actually a pilgrimage site for modern clowns.

Who knew the Devil's domain was a hot spot for tubing?

The Master of Magnetism dominates the walls of a scrap metal yard to keep graffiti artists at bay.

This desert oddity hides in plain sight thanks to a cartographic error and a desert explorer with a punny sense of humor.

A long spiraling walkway winds through the woods, and around a copper beech tree at the center.

An uber-secure, windowless tower of doom in the center of Manhattan is an NSA spyscraper.

Hundreds of stones dangle from barren trees in the middle of the desert.

The remnants of an early American attempt at missile defense.

This cuddly rodent has a place of honor at a Russian institute for genetic research.

A sobering scientific reminder of the human damage caused by the advent of the nuclear age.

An institution dedicated to curiosity, logic, riddles, and Mongolia's long history of puzzles.

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

A hands-on traveling collection of the innovative devices of yesteryear.

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

The one-stop shop for all of your superhero (or evil arch-nemesis) needs.

New York's oldest magic store.

Hidden in plain sight on a pair of Manhattan subway tunnels are a pair of public instruments that sing to each other.

Underground vaults of a former brewery beneath Brooklyn's Crown Heights are now used to ripen cheese.

Hidden in one of New York's oldest subway stations is the final remnant of the site of the bizarre Shakespeare Riots.

The most magnificent bottle house in a town strangely full of them.

Vietnam's feral abandoned water park offers access to a post-apocalyptic funscape, now with fewer crocodiles.

A Cold War command center is hidden under an idyllic countryside.