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

Amsterdam's former hotspot for public executions and dissections.

Museum preserving torture methods from the past.

An early Portuguese serial killer's head is alarmingly well preserved in a jar at the University of Lisbon.

Elaborately carved to showcase the glorious wealth that the age of exploration brought to the Portuguese empire.

A king's pet, a pope's gift, an artist's inspiration, and a tragic shipwreck.

The world's oldest bookshop still in operation.

An artificial date palm stands as a memorial to Warsaw's Jewish community.

Special benches that play Chopin's music are scattered throughout his native city.

A statue honors the children who fought Nazis in Poland.

The Polish capital has had a deep connection to its guardian mermaid for almost a millennium now.

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

An incarceration museum on the spot of possibly the oldest prison in England.

This South London cemetery holds the remains of more than 15,000 people.

This Parisian café is dedicated to great tea and the art of knitting.

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

The vast, legendary catacombs hold secrets much stranger than stacked bones.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

One of the last umbrella repair shops in Paris upholds the nostalgic art of umbrella making.

Notorious artist squat renovated into legal studios.