A French library that makes sure its love of books is writ large... giant in fact.

Three floors of musical instruments coming from all corners of the world and hundreds of years of musical history.

Jesus' footprints and the first catacombs in the world.

Pop culture has helped to keep this iconic British building from being destroyed.

Traditional 11th-century outdoor tannery.

On La Gomera, "Silbadors" communicate in a 4,000-word language of whistles.

A crumbling island fortress that seems to be covered in a field of stone crosses but is simply incomplete.

Sky ships, planes, and portraits left as unique tokens of hope and thankfulness.

The tomb of a hard traveling saint is constantly covered in shoes as offerings to heal disabled youth.

This museum houses an imposing skeleton army comprised of creatures great and small.

A colossal sculptural lion built by the same man who designed the Statue of Liberty.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

One of the few remaining ancient aqueducts described by Frontinus as 'the most solemn testimony of the Empire.'

A giant white horse drawn on an English hillside may not have been intended to be a horse at all.

This traditional festival celebrates a family of wooden giants that have survived Nazis, wars, and religion.

Replicas of Apollo's leonine stone guard cats still line a sacred row in Greece.

An ancient church on a tiny island covered in stone bible stories has controversially been turned into a museum.

A marvel of Byzantine engineering under the streets of Istanbul.

Ancient serpentine sacrifice holder that has stood the test of time.

This narrow path was cut right into a French mountainside to feed the country's early naval expansion.

A cave dwelling that was started by the Celts, expanded by monks, and finished by knights.

This religious complex carved into a cliff is steeped in legends of miraculous stags and the Holy Grail.

This bridge was constructed from the rubble of the infamous Bastille.

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