At one of Berlin’s oldest churches, visitors can place mosaic tiles to help restore a medieval mural.

The last remnants of a massive medieval wall that once encompassed the city of Berlin.

A socialist building dedicated to teachers showcases one of the largest Soviet mosaics in the world.

A museum dedicated to a Cold War era sausage.

A haunting contrast of trains that both saved and took the lives of Jewish children in Nazi Germany.

A stone from Africa's tallest peak is immortalized in a Potsdam palace—but is it actually the mountaintop?

If you visit the burial place of King Frederick the Great, you'll likely find a couple of potatoes sitting on his tombstone.

The "Prussian Versailles" that is as glorious today as when it was built.

A prime example of socialist modernist architecture, wrapped in a enormous fresco about the media.

This 1920s Dutch barge is now a floating bookstore.

A faded reminder of what was once a common sight in London during the Blitz.

In a quiet neighborhood in the south of Berlin is one of the most ambitious social housing experiments of the 20th century.

This 500-meter-long memorial pays tribute to the hundreds of thousands of lives lost to COVID-19 in the UK.

One of America's founding fathers lived in this London lodging between 1757 and 1775.

An exercise in radical design and social living that became the epicenter of Soviet spy networks in London.

One of London's oldest houses contains a mixture of both old and modern features.

A friendly pub with a sordid past in cock fighting.

A totem pole of heads to represent the different stages of life.

The largest of London's subterranean rivers and once a mad, bad center of London life.

The world's first underground farm is in a World War II bomb shelter beneath the streets of London.

Hackney's newest private museum and natural curiosity shop.

One of the largest numismatic collections in Europe fell victim to a huge theft.

This secret garden has bloomed into London's most unique hub of urban creativity.

This plaque in one of London's oldest public hospitals commemorates the first meeting of two of Britain's most famous literary heroes: Sherlock Holmes and Dr. Watson.