In an area where the remnants of WWI are discovered on a regular basis this preserved frontline trench may be the most amazing.

A rare example of World War I trenches from the British front.

Hiding the longest subterranean river known in the world.

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

Part modern art project, part traditional chapel, this see-through church is only substantial from the right angle.

It's forbidden to dig within this ancient Roman fort hidden beneath a playground.

The largest 19th century panorama in the world still in-situ.

“And the Lord said unto Johan, build for thee an ark for the end of the world is approaching.”

A grassy pyramid named after a French battle.

A Portuguese Jewish cemetery filled with stunning grave monuments that date back to 1614.

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

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

Invisible bridge parts the waters, invoking biblical images and preserving the ominous feel of an ancient moat.

Colorful and chaotic stacked hotel in North Holland.

A beautiful maze marks where three countries meet.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.