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

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

This Slovak bridge is known both for its connection to a national uprising and its UFO-shaped eatery.

This Slovakian statue of an emerging sewer worker might just be a bronze peeping tom.

A whimsical bridge adorned with decorative dragons.

This abandoned Slovenian military barracks has become a punky-political art squat.

This one-time health resort was used by aristocrats around the world.

Romania's triumphal arch looks out over Bucharest.

The former Nazi Germany concentration camp stands as a museum to remember this dark chapter in European history.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

The largest free-standing aquarium in the world resides in a hotel lobby in Berlin.

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

A fascinating insight into daily life in the Eastern Bloc.

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

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.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Baroque celebration of the end of the Great Plague of Vienna.

The beautiful, ornate weather station is the most popular geocache in Salzburg.

Amsterdam's narrowest house facade is a monument to 17th-century tax evasion.

This city square is home to Amsterdam's oldest church and a statue honoring Dutch sex workers.

These spartan apartments are provided to clergymen visiting Vatican City.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

This is the largest cemetery in Ireland and the first cemetery museum in the world.