Revitalization efforts converted a former U.S. military heliport into a sprawling urban park.

Carved fountains poignantly placed in parks and in front of special monuments.

From Nazi chemicals to the CIA, this architectural marvel has played a fascinating role in German history.

This magnificent church allows travelers along one of Germany's busiest roadways a chance to rest and reflect.

A top-secret bunker now turned museum, is an eerie look at what life would have looked like in the event of nuclear war.

Sitting in the basement of a castle, the largest wine barrel in the world is bigger than most apartments.

This historic funicular system combines the old with the new while offering delightful views over the surrounding valley.

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

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.

A sandstone block marks the alleged spot where the legendary writer was conceived.

An architectural marvel that spans the Arda River, and has stories of a haunted past.

This off-limits room in the National Library of France is home to a system of pneumatic tubes, once used to bring books to readers.

There has been an astronomical clock on this spot since the 14th century.

The castle was reconstructed to fit Kaiser Wilhelm II's romanticized vision of the Middle Ages.

This bunker in northern France was built by Nazi German forces with the intention of launching up to 50 V2 rockets at London each day.

This medieval castle overlooking the Elzbach river looks just like it did hundreds of years ago.

This noble mash-up in eastern Luxembourg is part Medieval, part Renaissance, all castle.

This tri-part waterfall is a little bit of fairytale beauty in the heart of Luxembourg's Little Switzerland.

An expansive complex of subterranean tunnels is all that remains of one of Europe's most formidable medieval fortresses.

A historic casino where Dostoyevsky is said to have lost it all on a single spin of the roulette wheel.

This Nazi-built amphitheater was constructed on a sacred mountain site used by various German cults.

This Cold War–era fallout shelter was actually a storage facility for the nation's emergency currency.

Now overgrown, these anti-tank barriers from World War II are sometimes called "dragon's teeth."