A sprawling Baroque park with 300-year-old hydro-pneumatic waterworks.

The oldest Jewish cemetery in Europe survived Hitler's Germany.

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.

Dedicated to the American general whose reply to a German demand for surrender was simply "Nuts!"

Berlin's old airport.

This incredible stone temple is a monument to death, victory, and fantasy architecture.

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

A towering monument to war, located on a beautifully peaceful hill.

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

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

An abandoned NSA listening post on Berlin's "Devil's Mountain."

Tiny memorials honor individual victims of the Holocaust.

Slaughterhouse Five opens its dank doors to fans of Kurt Vonnegut.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

This striking fort on the Maginot Line looks just as it did after being destroyed in the Fall of France.

Despite attempts by local police to discourage it, Beatles-inspired graffiti has been a means for artists to air grievances for decades.

What looks like a suicide in progress is actually a statue of Sigmund Freud.

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

A church of bones, decorated with 40,000 human skeletons.

Europe's second largest ossuary wasn't discovered until 2001.

Perhaps the most spectacular grotto along the Algarve coastline.

This unassuming chapel in Portugal plays host to a ghoulish collection of bones.

This small chapel is built of human bones and decorated with a golden skeleton.