Built to give thanks for the passing of a plague epidemic, this cathedral is a one-of-a-kind architectural hybrid.

St. Mary's features one of the most spectacularly decorated cathedral interiors in all of Europe.

Some 80,000 Delft Blue tiles line the inside of this Amsterdam walkway.

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

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

These eight mummies are the best-preserved human remains ever discovered in North America.

Greenland's first shopping mall also hosts the country's government.

High atop the Eiffel Tower is a small apartment built exclusively to entertain the science elite and make the rest of Paris jealous.

Paris' linguistic guide to the international language of, yes, love.

The fairy tale castle of the “fairy-tale king,” this was also the inspiration for Disney’s “Sleeping Beauty.”

A random tree outside a Budapest hotel has become a DIY shrine to the late singer.

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

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

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

This automated sculpture of two men peeing will spell out text messages with their micturition.

A 400-year-old mummified arm dangles from the ceiling of St. James the Greater, serving as a warning to thieves.

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

Macabre astrological automaton clock dating to the late 1400s.

Countless grotesque faces stare out from this eerie Prague art wall.

These former Nazi anti-aircraft towers offer a singular view of the north of Berlin in the summer, and a sanctuary for bats in winter.

Berlin's old airport.

A fascinating insight into daily life in the Eastern Bloc.

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

Model Trains and Much More in Hamburg.