This historic Amsterdam bar used to accept sailor's monkeys as payment.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.

This enormous storm barrier is one of the largest moving structures on Earth, with each arm taller than the Washington Monument.

The Rozenberg wind wall in South Holland makes for smooth sailing through the Calandbrug canal.

The walls and ceiling of this Polish church are decorated with thousands of skulls, with another 21,000 skeletons just below.

In the midst of a living monument to Soviet social engineering, Polish Catholics built this church by hand.

Lithuania's outdoor sculpture trail of wooden folk art.

Sculpture garden of religious statues made it through Soviet rule.

Terrifying derelict military hospital once housed a recuperating Hitler.

A curated museum of wooden sculptures inhabits this Russian home.

An industrial relic is now one of Europe's most staggering art spaces.

Tucked away in a small German apartment is an eclectic museum devoted to West African vodun culture.

This monolithic slab of art metal crowns a German slag heap.

Hitler's bleak vision of relaxation still stands as a mostly abandoned 10,000-room resort complex.

The Bauhaus-style former industrial complex is considered the world's most beautiful coal mine.

A former ironworks that was the first UNESCO industrial site.