These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

A restaurant and observation deck built in a unique broadcasting antenna.

Its vast collection details the history of this Santa Barbara beach town.

Graffiti-covered ruins that were once part of a farm owned by a mental hospital.

French prisoners carved these boats from the bones of their meat rations.

A local landmark with generations of spraypainted messages, and more being added each day.

A lone cannonball remains lodged in the walls of the Hotel de Sens as a sober reminder of a revolution.

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

France's national museum of scientific and industrial instruments.

Walk upon the mementos of the dead in this Parisian courtyard paved with medieval tombstones.

135 bronze medallions mark a French meridian line which once rivaled the hotshot Greenwich timeline.

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

The celebrated eyesore created by starry-eyed sweethearts.

A museum on the history of Paris, including a set of Napoleon's toiletries, Proust's room, and relics of the Revolution.

A mechanized clock where a man fights off a dragon, crab, and rooster.

Notorious artist squat renovated into legal studios.

A Nesting Doll of Churches.

World War II-era Nazi compound nestled in the Santa Monica hills.

Acres of natural wonders left behind by a socialite-turned-gardener.

A breathtaking bridge that crosses a vast gorge over a river's torrents, and has a tale of a devil architect attached.

The alpine falls where Sherlock Holmes apparently met his demise can actually be visited.

This amazing pedestrian suspension bridge in the Swiss Alps would give Indiana Jones nightmares.

The tallest outdoor elevator in Europe rockets passengers on a dizzyingly precarious ride to the top of a mountain.

This memorial commemorating fallen Swiss Guards of the French Revolution has been called the saddest stone in the world.