This incredible stone temple is a monument to death, victory, and fantasy architecture.

Naturally formed rock city in Poland.

An extensive network of secret tunnels was created for the Nazi project "Riese."

A fairytale Gothic castle steeped in Nazi treasure conspiracy theories.

This centuries-old wooden wonder was built in less than a year and is one of Europe's largest timber-framed churches.

Colorful and chaotic stacked hotel in North Holland.

The 20-mile causeway that separates the Netherlands from the sea.

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

This 1,400-year-old abbey was once a powerhouse for music and intellectualism known across Normandy.