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".

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

A Jenga-style cylindrical tower of books that appears to go on forever.

Macabre astrological automaton clock dating to the late 1400s.

Dedicated to the man who saved hundreds of children from Nazi-occupied Czechoslovakia.

Op-art architecture designed for happiness.

Vienna's diversity-themed traffic lights were inspired by the Eurovision Song Contest.

The beautiful baroque library of the Hapsburg empire.

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

This 135-year-old weather station studied the effects of the climate on human health.

A peculiar museum that includes many drunken tales, a drunk driving simulator, and much more.

A 19th century artistocrat's mansion, turned into a library, hidden in a modern library.

A Trabant car, a kangaroo statue, and a plethora of plants take over this abandoned-factory-turned-bar.

On Gellért Hill, this statue depicts the tragic tale of lovers divided by the Danube.

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

Once the home of a hermetic monk, this cave now houses a small church.

A much-loved sculpture depicting the hero of a 1956 anti-Soviet uprising.

A 13th-century convent where St. Margaret of Hungary spent her teenage years.

Built in 1870 at the bridge that connected Buda and Pest, this spectacular incline railway was almost lost forever during World War II.

The geographical center of Budapest is marked with a 10-foot-tall stylized zero.

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

A whimsical bridge adorned with decorative dragons.

In between two buildings in Ljubljana, medieval tunnel to nowhere.