A brush maker used his factory to protect blind Jews from the Gestapo.

Beneath the impressive baroque cathedral that rises from the center of Berlin lies the largest collection of Prussian royals in the world.

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

A collection of abandoned typographic signs from Berlin and beyond.

Known simply as "The Hand," this famous public sculpture in Berlin was featured in a Depeche Mode music video.

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

A memorial in the Tiergarten is a reminder of the suffering inflicted on homosexuals by the Nazi regime.

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

A historic fire call point.

One of the world's heaviest musical instruments towers within a popular urban park.

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

A museum specifically dedicated to the Trabant, one of the iconic automobiles of the GDR.

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

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.

A floating cat sanctuary on an Amsterdam canal.

This massive mural by famed pop-artist Keith Haring was hidden for almost 30 years until its 2018 rediscovery.

A beautifully eclectic mix of architectural styles.

Amsterdam's former hotspot for public executions and dissections.

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

An ancient passage filled with stalls selling used books, once frequented by Vincent Van Gogh.

Where royalty waits in the height of luxury.

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

The attic of a four-century-old canal house hides a clandestine church.