Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

Monument to a suicide protesting the Soviet invasion.

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

A narrow passage next to a cafe leads to a courtyard exploding with murals, tags, and paste-ups.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

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

Dedicated to the European Sinti and Roma peoples murdered during the Holocaust.

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

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

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

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.

One of the best-preserved Roman amphitheaters is still used today, but for less brutal events.

This narrow fjord-like bay is the largest ria in the Mediterranean Sea.

This one-of-a-kind archeological site is home to strange prehistoric ruins, the original use of which is still a mystery.

The Roman Emperor's lost summer home and grotto full of enormous sculptures sit along the Italian seashore.

This ancient market is often referred to as the oldest shopping mall in the world.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

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

Breathtaking and huge 430 year old maps of Italy.

Fountain where visitors can earn a license to be mad.

Nine caves filled with recently-discovered archaeological finds under the houses and the streets of the most ancient district of an old town.

Water and windows define this defensive Italian well.

Romans built the world's tallest artificial waterfall in 271 BC.