An Orwellian sculpture with eyeball cameras watches passersby.

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

Macabre astrological automaton clock dating to the late 1400s.

This spooky statue sits outside a famous Prague theater.

A turn of the century building boasting some of the most beautiful art nouveau architecture in Prague.

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

Famed for its pie, this eatery has a hidden tunnel that allowed Catholics to secretly walk to church during the Reformation.

One of Amsterdam's narrowest houses is located right across the canal from its widest.

An Amsterdam street lined with antique shops each one dedicated to a different obscure collection.

Amsterdam's former hotspot for public executions and dissections.

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

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

Each time a baby is born in Ghent, these streetlights flash in silent celebration.

One of the most important yet well-hidden museums dedicated to the history of medicine.

This old wooden funicular railway leads to a cemetery in the forest.

This natural hill rose another 130 feet from the debris and rubble added after World War II.

Walk inside a half mile long crevice right outside the town of Garmisch Partenkirchen.

The final resting place of the famed German pilot, the "Red Baron."

Paris' fabled purveyor of exotic taxidermy and natural history curios.

The floorboard scrawling of a tragic madman is on public display outside a Paris hospital, much to the dismay of its opponents.

The Sun King's military models, saved from the Louvre.

One of the oldest masonic museums in Paris.

The tomb of history's greatest potato promoter is surrounded by tubers.

Inside a former cabaret, seven floors of erotic art.