Around 100,000 bodies are buried below the medieval headstones, many of which mark graves with multiple bodies stacked up to 12 deep.

This doorless 20th-century elevator doesn't stop or slow down.

Macabre astrological automaton clock dating to the late 1400s.

A castle from the Holy Roman Empire that hosts traveling youth... in its stables.

This abandoned coliseum was intended to be a grand Nazi rallying ground before it was halted at the end of the war.

The celebrated eyesore created by starry-eyed sweethearts.

Remains of the artificial harbours invented for the Allied invasion of Normandy can still be seen at sea.

A memorial to the nearly 10,000 American soldiers laid to rest on the beaches of Normandy during WWII.

Notorious artist squat renovated into legal studios.

Etched into a dry lake bed, this massive directional indicator is accurate without magnets.

This stretch of beach along California's central coast is a busy highway for the largest seal in the northern hemisphere.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

Every hour the doors open to reenact the legend of the heroic mayor who saved his town by drinking a gallon of wine.

Dress up like a miner and take a slide into the disco-lit depths of this once foundational salt mine.

Soaring over 6,000 feet in the Bavarian Alps, this beer garden was once Hitler's 50th birthday present.

A sign at the end of the Santa Monica Pier marks the traditional end of the legendary American highway.

The unbelievably opulent home built for an infamous newspaperman.

At Washington's Dulles Airport is a satellite museum (no pun intended) with three quarters of a million square feet of aircraft history.

Soldiers were buried next to Lee's house in the center of Arlington Cemetery to dissuade the general from reclaiming his property after the war.

The site of Austria's biggest concentration camp now honors its victims.

Vienna's giant wonder wheel had a starring role in one of the greatest noir movies of all time.

Elvis's own personal tropical hideaway.

Look closely and you’ll notice that the color changes a third of the way up the tower.

The preamble to the U.S. Constitution written entirely from vanity license plates hangs in the Smithsonian museum.