The heart of a Scottish legend had a centuries-long journey before reaching its final resting place.

How did the right arm of a 13th-century English bishop wind up in a Connecticut church?

This futuristically sylvan church is a glass-enclosed marvel of modern architecture.

These delicate buggers are some of the rarest fossils that have bubbled up from the Tar Pits.

This mysterious, medieval cathedral remains unbuilt but fiercely protected.

Lyon's "Wall of the Silk Weavers" is one of the largest murals in Europe.

This curious Tudor-era castle was once home to Napoleon's greatest adversary, the Duke of Wellington.

A striking glass tribute to two sisters who suffered during Scotland's "Killing Time."

Barcelona's historic 19th-century sewers, whose foundations were laid in medieval times, are open to the public for exploring.

This cemetery features modernist statues as strange as its name.

The only urban monument in the world designed by the great surrealist painter Salvador Dalí.

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

Paris' fabled purveyor of exotic taxidermy and natural history curios.

This French ghost town from World War II has been left as a memorial to German atrocities during World War II.

"In the Dark" Restaurant in Paris offers dinner in complete darkness.

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

This massive library holds what was once the largest book collection in the world.

Abandoned railway line circling the city of Paris.

This 1,300 year old monastery built atop a single rock was once only accessible depending on the whims of the tide.

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

Twelve grave-faced marble angels guard the emperor's tomb at Les Invalides.