King Carlos IV laid the first stone during construction of this chapel.

A Baroque mansion with ties to legendary magicians and alchemists.

In an area known in Bratislava’s postal history, this sculpture sits equipped with a functional postbox.

Rent out a glass igloo to watch the Northern Lights like you live in the future.

A gift from Emperor Franz Joseph I to his wife.

The metal leaves on this tree are engraved with the names of Holocaust victims.

The holes in this wall provide a glimpse into Jewish life in Budapest, both past and present.

A triumphant marble and bronze fountain depicting a 15th-century Hungarian king and his hunting party.

From cartoon characters to tiny tanks, a guerilla sculptor's little bronze statues are hidden throughout the city of Budapest.

On Gellért Hill, this statue depicts the tragic tale of lovers divided by the Danube.

A scene from one of Hungary's most famous novels.

Launched by Napoleon's soldiers more than 200 years ago, a cannonball remains embedded in the tower wall.

A water reservoir disguised as a castle stands atop a hill in a park in Stockholm city.

According to legend, this tomb holds the secrets to time travel.

This plaque marks the former home of one of the first women physicians in the Netherlands.

A half-buried vehicle in Prague's is the latest iteration in a long-running piece by Czech artist David Černý.

King of the Saxons on top, Roman goddess of wisdom on the bottom.

A defensive structure built during the Hundred Years War has remained useful in one way or another for nearly 700 years.

Sometimes called the Banksy of Madrid, Muelle was a pioneer of street art in the Spanish city.

A bridge that has seen many reiterations over its lifetime.

A century-old prison in the heart of Vilnius is now a lively bar, dance club, and artist residency.

A massive stone fox oversees a Rotterdam elementary school crosswalk.

This record shop and unofficial black metal museum is an ode to Oslo's heaviest musical export.

This 16th-century cemetery became a recreational park during the Soviet occupation—today it's a little bit of both.