Super-heavy Nazi architectural experiment.

Metro station with a claim to rock n' roll fame.

Dine at a legendary after-hours joint frequented by David Bowie and Iggy Pop.

The world's first motorway was used as a racetrack until the late 1990s.

A local train station entrance hall doubles as a sanctuary for barn swallows.

This spectrum of a star was observed by one of the world's most accurate spectrographs. 

A historical observatory still in use by modern astronomers.

Germany's Glienicke Bridge has a shady history of clandestine meetings, espionage, and spycraft.

A quaint Russian village in the middle of a German metropolis.

Solar observatory doubles as a daring display of Expressionist architecture, much to Einstein's chagrin.

The metal-free wooden towers of Brück.

Volkswagen's dedicated museum dives into the complex history of one of the world's best known cars.

This gilded emblem was once stolen by a Cookie Monster impostor, who demanded a charitable ransom for its return.

A unique museum that uses visual art and storytelling to reveal the hidden history of the Gullah Geechee and their African ancestors.

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

A melancholy jester sits on the grave of a famous 20th-century ballet dancer and choreographer.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

Paris' linguistic guide to the international language of, yes, love.

Montmartre's sole surviving windmill became an iconic landmark for 19th-century painters, artists, and bohemians.

Nicknamed "Karri Knight," this Eucalyptus was planted in 1895 and stands at 72 meters.

One of the largest Roman settlements in Portugal.

For more than two centuries, the canopy of this venerable tree has been a haven for songbirds and lovers.

This architectural beauty is the home to a personal collection of more than 600 examples of mechanical musical instruments.

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