Located in an old church, this brewery produces a different kind of holy water.

This Stockholm light tower can be controlled by anyone with a smartphone.

Sweden's first nuclear reactor, R1, can be visited 25 meters underground.

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

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

A favorite Paris bar for U.S. expats, including Gershwin, Hemingway, and James Bond.

The oldest stone house in Paris was built by its most famous alchemist.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

A mysterious bridge over a sunken Roman road.

Local legends say that fairies used to dance in the moonlight here and invite handsome young men into their grottoes.

Near Birmingham, England three and a half miles of top-secret tunnels housed a World War II “shadow factory” and a Cold War nuclear bunker.

This unchanged Victorian park is rumored to have been the inspiration behind Peter Pan's Neverland.

An engineering error ensured this cavernous 350-foot-long subterranean thoroughfare was never used as intended.

An English artist has turned an unassuming ex-council house into a time-lost house of mystery.

No one knows who created the statues or if they are arranged properly—let alone the artwork's real name.

This crumbling folly looks like an enchanted left over from Middle Earth.

A open air theatre built on a cliff by an eccentric British woman.

This haunting stone chasm is a hotbed of mossy rock and English legend.

Grab a cuppa at England's first and only domestic tea plantation.

This artist's home turned gallery/museum preserves the creator's love of "Eastern" influences.

Fascinating town where normal life interfaces with the occult.

Dictionary Johnson’s favorite feline.

These ancient sunken lanes were naturally tunneled into the soft ground by countless footsteps.

Created hundreds of years ago, the magical follies and landscapes at this park were almost lost to time before being restored.