Historic medieval fortified city in southwest France.

A formerly opulent Italian village is now a crumbling ghost town that no one really knows what to do with.

An Italian hillside ghost town.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Large Hadron Collider and the Birthplace of World Wide Web.

One of Ireland's most infamous prisons for rebels including men, women and children.

The gorgeous library at Trinity College is home to remarkable treasures of Irish identity.

Trek up this glacier before it disappears.

France's high-tech, future-themed amusement park.

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

The opulent home that inspired Tintin's Marlinspike Hall and the adventures within.

The ruins of a medieval castle linked to the murderous French lord that inspired the famous legend of Bluebeard.

An unsettling shrine dedicated to the ravenous beast that prowled 18th-century France.

Hundreds of prehistoric stones, arranged in perfect lines in a French field.

This stunning French estate was so lavish that it landed its original owner in jail for the rest of his life.

This French castle is said to have once held the Holy Grail but is now a gorgeous mountaintop ruin.

The great Italian Renaissance painter was laid to rest here in the Chapel of Saint-Hubert.

Sacked by Vikings, blessed by William the Conqueror, dealt a fatal blow during the French Revolution—these ruins have seen it all.

The oldest stone house in Paris was built by its most famous alchemist.

This iconic Parisian bookstore doubles as the "Tumbleweed Hotel" for traveling writers.

France's most famous cemetery, with some of its most curious tombs.

The macabre collection of Jacques Sirgent, an expert scholar on the undead and all of their trappings.