Abandoned Nazi train station turned underground astroparticle laboratory.

Established in 1638 to battle the Black Death, Hortus Botanicus Amsterdam is a treasure trove of rare flora.

This museum housed in a former brothel explores the past and present of sex work in Amsterdam.

Museum preserving torture methods from the past.

After this historic church was destroyed by World War II bombing, its blackened shell was left standing as a monument.

Where once there was a train station bathroom, there is now this German burger joint.

On the Spree bank, discover one of the last reminders of a symbolic wall that divided, and was torn down by the people.

This futuristic German spa allows visitors to float in a pool of salt water while zoning out to underwater techno.

This watchtower once presided over the Berlin Wall.

The walls of Germany's Parliament still show the scars of the Red Army takeover in World War II.

Reminders of the Battle of Berlin still scar the railway.

A fascinating insight into daily life in the Eastern Bloc.

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

Underneath this small church are 15,000 bones, arranged by an obsessive academic.

Walk through Czech history in Prague's largest graveyard.

Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

A saintly relic hidden in a Prague church basement.

This spooky statue sits outside a famous Prague theater.

Bullet holes in the church wall are a reminder of the violence that followed the assassination of a high-ranking Nazi officer.

This Prague museum collects brutalist relics and memories from the country's former Soviet rule.

A giant interactive periodic table with real samples of the elements.

A collection of anatomical samples from one of the first anthropologists to suggest that humans reached North America by crossing the Bering Strait.

This uber-quaint Polish village is known for its habit of painting elaborate floral motifs on just about everything.

Poland's oldest salt mine has nearly everything one needs to live underground forever.