There has been an astronomical clock on this spot since the 14th century.

Christ's blood preserved in a Belgian town.

Museum in a swimming pool where the water still flows.

One of the largest ochre quarries in the world, hidden in a limestone landscape.

One of the most powerful religious centers in the Middle Ages, dubbed the founder of Western monasticism.

For over 300 years this little carving has been the city’s good luck charm.

A Gothic cathedral created from volcanic rocks.

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

An isolated 17th-century chapel on a remarkable site once dedicated to Celtic sun worship.

A copy of the Statue of Liberty greets visitors to the birthplace of Auguste Bartholdi.

The only "Egyptian" pyramid in Europe and the legendary tomb of Remus.

Rome's semi-secret peephole vista is also a former Crusader stronghold.

The Pope’s secret escape route.

This ritzy Italian market is built around a statue of an unforgiven heretic who was burned for his belief in an endless universe.

The yawning maw of this pagan visage is said to bite off the hands of liars.

A master of trompe-l'oeil creates a stunning, tourist-fooling dome out of a flat ceiling.

A Nesting Doll of Churches.

The skull of the patron saint of lovers lies in the Basilica di Santa Maria in Cosmedin—maybe.

One of several skulls claiming to belong to the beheaded St. John the Baptist is on display at this Roman church.

This Roman arch marks the location of an ancient gate at one of the Seven Hills of Rome.

The crypts of Capuchin friars decorated with the bones of over 4,000 friars, including an entire "crypt of pelvises."

Installed in an act of one-upsmanship, the annual sundial in this church is also a symbolic victory for the Gregorian calendar.

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

This modern museum of Mediterranean culture is surrounded by a surreal concrete honeycomb.