This tipsy office building in downtown Prague was originally called “Fred and Ginger.”

Macabre astrological automaton clock dating to the late 1400s.

This Budapest bar allows drinkers to leave their mark on the walls, floor, and even ceiling.

A trail of iron footwear stands as a monument to the thousands executed along this riverbank during WWII.

From Austrians to Nazis to Soviets, this historic Budapest fortress has a history as complex as the city itself.

A museum dedicated to a secret military hospital hidden beneath a castle in Budapest.

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

Cold war icon and onetime "hole" in the iron curtain.

The bunker where Hitler took his own life is hidden under this deliberately ordinary parking lot.

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

The site of the famous Nazi book burning campaign of 1933 remembers its "Night of Shame".

Berlin's natural history museum houses the world's largest mounted dinosaur and the late beloved polar bear Knut.

A museum dedicated to the history of a terrifying secret police is now held in their former headquarters.

The most visited, and possibly most controversial, museum in Germany.

A vista of the city and sea from atop the little-known viewing deck on an unassuming Columbus statue.

Catalonia Tradition: Beating the hollow Christmas log until it defecates in your fireplace.

One of Antoni Gaudí's most classic buildings is well-known for its "dragon-back" design.

Hidden away in a modern library are the remains of one of the 18th century's most celebrated wunderkammers.

An abandoned set from the 1980 film "Popeye," claimed and repurposed as a theme park by creative locals.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

This winding road through an Italian canyon may be the most scenic drive in the world.

Pilgrimage site for star-crossed lovers.

A medieval fresco which reminds visitors that death will come for us all.

Two very green residential towers cleaning the air in one of Europe's most polluted cities.