This Grade II Listed Building with an Art Nouveau façade once contained a unique print shop.

An early 20th-century sanatorium, long abandoned and now being reclaimed by nature.

This Neapolitan exhibition hall grants weird and wonderful insight into the intricacies of human biology.

A plaque claims this artwork outside a children's hospital was used in the 1998 Quidditch World Cup.

One of the world's tallest statues is also one of its most hated.

Some Moscow residents once claimed the bizarre, contorted mass of metal on top of the building was used to manipulate minds.

This colossal couch is an unlikely monument to Europe's first female Doctor of Law.

The gorgeous entrances into the city's underbelly look more like grand halls than subway stops.

A labyrinth of ancient tunnels hidden below the city holds the ruins of 2,500 years of history.

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

The abandoned "Red Star Train Graveyard" is the final rusting place for precious artifacts of train history.

A state-of-the-art medical facility from the Imperial era is now a derelict ruin.

This newly renovated Soviet-era outdoor exhibition center is bigger than the principality of Monaco.

The ghost town left by the worst nuclear disaster of all time is being taken over by nature and urban explorers.

Warsaw's fantastically preserved gasworks...almost.

This abandoned asylum in Wales might look haunted, but it's still beautiful.

This is not only one of the oldest collections in Europe, but also possibly the most beautiful.

This long line of cement defensive wedges is named after the famous chocolate bar for obvious reasons.

This ancient ruined monastery has been destroyed by fire so many times that it seems like God hates it.

One of the largest museums in Ukraine remembers the story of the German-Soviet War in iconic, brutalist style.

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

This former Welsh metal factory is now a lovely abandoned relic but was once one of the industry's world leaders.

The music is over at the Ballhaus Riviera Ballroom, but the ballroom remains in haunting disrepair.

The vast chamber inside this abandoned cooling tower looks like something out of a sci-fi dystopia.