This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

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

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

This Polish cave has housed a dragon, a brothel, and an enduring legend.

This TV tower once secretly housed a GDR intelligence team.

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

This lurid German fountain plots the sad course of marriage from dating to death.

A museum that chronicles the history of the Nuremberg Trials for Nazi war criminals in the building where the trials were once held.

Construction of Barcelona's iconic (but controversial) church is expected to be completed in 2026—a century after the death of its architect.

A public urinal so pretty, it was declared a national monument.

The history and future of cannabis.

Europe's official "zero-level," the equator of elevation.

Amsterdam's former hotspot for public executions and dissections.

A Dutch passageway's artistic, aquatic-themed makeover pays tribute to the capital city's famed waterways.

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

A floating cat sanctuary on an Amsterdam canal.

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

It was once the longest continuously running cinema in the United Kingdom.

An eccentric memorial garden to the "warrior" birds of World War I, the messenger pigeons used by the Allied forces.

A half-mile-long stretch of medieval forts built after a devastating pirate attack persists amid the modern port city.

Now a memorial to merchant sailors and Titanic victims, this medieval church was destroyed by bombing raids in 1940.

This 700-year-old storehouse was a POW jail, aviation workshop, and Titanic memorial before becoming a brewpub.

This striking observation tower shaped like a spinnaker sail is the newest icon in historic Portsmouth.

The Last Home of an Executed King.