A centuries-old complex of hand-dug stone chambers has sheltered locals in times of trouble.

For a brief time in 1960s France, families could climb into a tiny submarine and be pulled along an underwater journey.

The tiny Belgian town's ancient version of Mardi Gras involves eerie wax masks, sticks for warding off evil, and ostrich plume hats.

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

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

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 gruesome biblical parade celebrates the one day a year that a bit of Jesus' blood turns to liquid.

This "social palace" housing complex created a relatively stable and self-contained worker's society... for a time.

This historic island prison holds one of the dungeons from the Count of Monte Cristo even though it is a work of fiction.

This ancient Roman bridge and aqueduct still stands as a wonder of classical construction.

Standing proud atop a Turkish bluff, this Ottoman palace has retained its grandeur despite being abandoned for centuries.

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

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

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

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

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

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

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

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

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

The former home of a trailblazing surrealist is still filled with haunting dolls and grim paintings.

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