The old observatory in Copenhagen has a spiral corridor used as a racetrack.

Danish tourist destination well known for open stalls where vendors sell marijuana on the street.

Pre-Nazi swastikas adorn the sculpted pachyderms flanking this brewhouse portal.

The de facto symbol of Copenhagen is this bronze fairytale which cannot seem to keep its head for very long.

Copenhagen's celebrated theme park and gardens.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

Thousands of coffin-like pillars make up this controversial Holocaust memorial.

An eerie, derelict amusement park in Berlin.

Home to more than 13,000 pieces of war memorabilia and military equipment.

This little replica of Lady Liberty provides a bit of NYC in a Japanese city.

Once a black market electronics marketplace, now an otaku shopper's paradise.

A 20-meter (65-foot) robot towers over Tokyo Bay.

Mysterious 500-year-old tapestries depict a unicorn hunt.

The experimental test tracks of a retro-futuristic monorail still stand in the French countryside.

France's high-tech, future-themed amusement park.

A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

In this Parisian garden's grotesque former life as a zoo it fed exotic animals to the bourgeois and put humans on exhibit.

The world's tallest bridge is also possibly the most elegant.

Ghosts of France's colonial past.

This charming cobbled backstreet is the most Instagramable street in Paris, much to the residents' annoyance.

A scandalous Art Nouveau collaboration that set Paris all atwitter at the turn of the century.

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

Notorious artist squat renovated into legal studios.

Ancient paintings known as the "Sistine Chapel of Cave Art."