"In the Dark" Restaurant in Paris offers dinner in complete darkness.

France's national museum of scientific and industrial instruments.

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

A surrealist timepiece by the artist of melting clocks.

A counter-culture bookstore like no other hides in plain sight in the streets of Paris.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

A haunting collection of the vanished and disappearing natural world.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

This massive library holds what was once the largest book collection in the world.

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

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

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

Notorious artist squat renovated into legal studios.

France's most famous cemetery, with some of its most curious tombs.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.

This eccentrically decorated palace is replete with grottoes, fountains, tunnels, and caves.

Inside this mansion turned museum, the works of prominent Croatian artists are on full display.

A tribute to an iconic act of defiance from the Croatian War of Independence involving a small car.

Yugoslavia's biggest underground airport lies in ruins.

A huge musical instrument played by the ocean.

Just a few miles from Novalja, a strange geological oddity has left scientists baffled.

Trimmed trees grow alongside the graves like topiary tombstones.

This beautiful Croatian fortress is haunted by legends of forbidden love.

This military tunnel dates back to World War II and provides visitors with a little wartime adrenaline.