An odd museum dedicated to French fakes.

The history of radiation is on safe display at the foot of a radiation science laboratory.

Down a cobblestone alleyway is a museum dedicated to Romanticism, with a secret garden.

A museum of magic with a Sadist past.

This Parisian café sticks almost exclusively to an ethos of reuse.

An all-American grocery store in Paris sells U.S. "cuisine" like Pop-Tarts and Heinz ketchup to homesick ex-pats.

Behind the pink curtain, Au Bonheur du Jour, an art gallery of erotic archives.

A haunting collection of the vanished and disappearing natural world.

This massive subterranean fissure is known as the "underground Grand Canyon."

The "dragon babies" of southeastern Europe.

Home of Philip Johnson, one of the 20th century's most influential architects.

A wunderkammer hidden on the top floor of the Hartford statehouse.

An Escher-inspired library dedicated to the wonders of the human mind, yet closed to the public.

An archival collection of over 2,200 case studies which includes human brain specimens and tumor specimens.

Yale University's home for rare works, including the mysterious Voynich Manuscript.

This small-town Connecticut restaurant gives each diner a free book from its vast library.

The intriguing personal collection of a professional demon-chaser.

A notorious punk house turned co-op.

One of the last full-orchestra recording studios in New York City and an acoustical marvel.

Empty, but not abandoned, this cavernous Brooklyn loading dock was once considered the largest individual building in the world.

Thriving meadows span a rooftop in one of Brooklyn's most heavily industrialized neighborhoods.

This futuristic airport terminal was abandoned for decades before reopening as a hotel—with a vintage plane of its own parked out back.

A collection of fanzines, recordings, and documents detailing the rise and influence of the feminist punk movement.

A hyper-luxurious, 12,000- square foot home might be buried beneath Queens, still waiting to protect you from nuclear missiles.