Bursting forth from a historic German neighborhood, these day-glo palaces are now a bright fixture in the town.

A purr-fectly spirited bronze celebration of local street felines through history.

This German monument honors the so-called "Prince of Mathematicians."

A thin pane of glass keeps visitors from sliding off this futuristic skywalk.

One of the most breathtaking railways in Europe also takes one of the steepest climbs, from fjord to mountain plateau.

Just off the city’s central station hides a quaint lamp-lit alley into medieval Elsinore.

The shiny silver little brother to Copenhagen's Little Mermaid statue.

A tombstone on the grounds of the royal castle marks the burial site of a Swedish king's beloved dog.

Longest road tunnel in the world features an air treatment plant and the illusion of daylight.

A spiralling hourglass-shaped tower rises from the forests in Denmark.

An unconventional and naturalistic sculpture depicting the artist marking his territory on an exterior faculty wall.

Long before ultrasounds and modern testing, medical specimens like these conjoined twins helped physicians learn about congenital anomalies.

The castle used by the Danish Royal Family as a hunting retreat.

The final resting place of the father of modern biological taxonomy.

Dedicated to the European Sinti and Roma peoples murdered during the Holocaust.

A memorial in the Tiergarten is a reminder of the suffering inflicted on homosexuals by the Nazi regime.

Berlin's old airport.

The site where a plot to assassinate Hitler was planned—and its conspirators were executed—is now a powerful memorial to the German resistance during World War II.

After a nearly successful attempt on Hitler's life, the conspirators met their fate in the courtyard of this Berlin building.

This platform is now a memorial dedicated to those who were deported during the Holocaust.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

This building holds the embalmed remains of the leader of the Bolshevik Revolution.

Stalinist skyscraper built with help of cryotechnology.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.