A swath of France so devastated by war it is still forbidden to go there.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.

The shape of this old salt factory complex was inspired by the course of the Sun.

This whimsical castle of grottoes was the labor of love of a French postman, and one of the greatest achievements of outsider architecture.

Before it was buried by volcanic ash, this fast-food restaurant fed the hungry hordes of ancient Rome.

From Vikings to nationwide rebellions, this castle has seen its fair share of warfare.

This 1960's Soviet submarine in Peenemünde Harbor claims to be the largest submarine museum in the world.

An icon of International Style architecture on the outskirts of Rotterdam.

A set of 27 bamboo tubes creates an eerie soundscape that changes with the wind.

This museum inside Amsterdam's largest cemetery explores how people deal with death.

A powerful statue sits on Scalestone Point, looking out over Morecambe Bay.

A remarkable feat of Victorian engineering across the Firth of Forth.

Crouch down, stretch tall, and be sure to flail your legs to pay homage to the Monty Python classic.

Dedicated to the American general whose reply to a German demand for surrender was simply "Nuts!"

For patriotic Russians, this memorial honoring the Soviet soldiers who died liberating Berlin in 1945 is the most sacred location outside of Russia.

While you wait to cross the street at a traffic light in Mainz, you might notice that the light is staring back at you.

This artistic fountain display pays homage to this area's theatrical history.

These ancient rock graves were featured on the cover of a Black Sabbath compilation album.

This church is named for one of the most dramatic tales in the early Christian church.

These lights mark the area of Rotterdam that was bombed and burned in 1940.

This artificial ring island was built to hold cubic tons of polluted dirt.

This 11th-century castle sits so low you can't see it behind the surrounding buildings.

An imperial church bombed to ruins during WWII now stands as a jagged memorial.

This former hydraulic laboratory is now a woodland dotted with old engineering models.