The ruins of a once-mighty medieval palace are hidden away in otherwise modern London

An empty bookshelf commemorates the books which were lost during the infamous event

Early Nazi prison for political prisoners.

Along the banks of the Teltow Canal in southwestern Berlin stands one of the city’s most controversial buildings, a hulking Brutalist laboratory that looks more like a warship than a research facility.

Relaxed riverfront dive bar where you can also rent a boat.

This spectrum of a star was observed by one of the world's most accurate spectrographs. 

A historical observatory still in use by modern astronomers.

One of the best-preserved pieces of DDR propaganda in Berlin.

An important message and optimistic splash of color in a troubled neighborhood.

Despite the name, this 16th-century structure in Galway wasn't built by the Spanish.

These murals stand as reminders to the troubled history of this Northern Ireland city.

A tree meticulously shaped and trimmed into the shape of an elephant.

Elevated brass pavilions form a kaleidoscope of fragmented views of the surrounding historic cityscape.

Carved scenes of sex work and unglamorous labour beneath a cultural hero.

This red light district plaza memorializes the Fab Four and their historic connection to the area.

Hidden in plain sight on a gable between two towers on the roof of shipping firm F. Laeisz' headquarter in Hamburg sits an unexpected bronze sculpture.

This dockworkers' lunch joint has been left leaning by a century of storm floods.

Hamburg's first legal sex work is relegated to a gated street that still does not allow pedestrian women.

Hamburgers are intensely proud of their tunnel beneath the river.

Once the tallest building in the world, this abandoned church is now a monument to the destruction of WWII.

An Anatolian immigrant created his own little paradise in the shadow of the Berlin Wall, made possible by the tensions of the Cold War.

A curious memorial to the Berlin Wall, German division, the war, and those who died at the wall.

The heart of Dutch football history.

A massive explosion that leveled hundreds of buildings in the city of Leiden is remembered by a waterside plaque.