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

A monument to the three wars that led to German unification towers within a Berlin traffic circle.

One of the world's heaviest musical instruments towers within a popular urban park.

Someone loved this song enough to carve all of its lyrics onto a tree trunk in a Berlin park.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

At one of Berlin’s oldest churches, visitors can place mosaic tiles to help restore a medieval mural.

One of downtown Berlin's last reminders of its Communist past.

An allegorical statue of a giant pregnant woman representing justice and truth.

A small alleyway with an unusual moniker.

A stunning architectural yet functional feat, towering over Oslo.

One man's exploration of the human form, including the bizarre and delightful "Man Attacked by Babies."

This 1920s Dutch barge is now a floating bookstore.

This historic abandoned train station looks like a stop for ghost trains.

A miniature Italianate fantasy village on the coast of Wales and the set of ITC classic "The Prisoner."

Where Agatha Christie mysteriously disappeared in 1926.

Artists have long been drawn to these atmospheric 12th-century ruins.

One of three sites in England that house the National Collection of Arms and Armour.

The name of this suspended sculpture is Latin for "high horse," which is exactly what it is.

Legend says this demonic carving inside a medieval cathedral was one of Satan's minions.

A well preserved remnant of the English Civil War.

This English medieval castle is where King John died of dysentery.

Wall Street has a new heroine, a bronze statue of a small but fierce girl.

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

World's largest bell sits on the grounds of the Kremlin in Moscow.