England's most notorious suicide spot.

This beautifully designed star-shaped fort was the premier defense system of the late 1500s.

Surreal riveted sea forts once protected the Kent shores from German attack.

This 600-year-old home seems to defy physics.

The last bastion of Roman presence north of the Alps looms over a German town.

This fairytale castle was built as a show of power but was nearly torn down thanks to its history of torture.

The ruins of this Dutch castle sit atop a labyrinth of once-secret tunnels and passageways, dating back over 900 years.

A luxury hotel housed in a former 15th century Gothic church.

This centuries-old gothic monster has been converted into a sprawling, glossy bookstore.

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

This massive steel pyramid can be entered by a set of jagged steps that let visitors stand in its heart.

No need to strap in for a “ride” on this walkable roller coaster.

This former steel and coal plant is now a neon-lit industrial fantasia.

A radio telescope for listening to the stars, based in one of the cloudiest countries in the world.

A UFO-shaped event building originally intended to be a science museum showcasing the future.

Scale model of St. Peter's Cathedral (Rome) in the middle of a small Dutch town.

The tallest waterfall in the Netherlands is a lovely, stepped feature that is only 50 feet tall.

This fairy tale forest hides scenes from some of the more obscure and bizarre Western nursery stories.

These slanted cubic abodes are a creative if odd solution to a zoning pickle.

A miniature city, once ruled by the Queen of the Netherlands.

Birthplace of the "Cat in the Cradle" and a cluster of iconic, original windmills that let the Dutch tame the seas.

Building Men of War and Indiamen from Holland's Golden Age.

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

A grassy pyramid named after a French battle.