An ancient ossuary in Rouen.

His "Lionheart" is entombed separately from the rest of his body.

This Roman statue is missing a limb from when the Venetians stole it from Constantinople during the Crusades.

Two stone columns flank the grand Venice square, but there were supposed to be three.

In the past, Renaissance sex workers were encouraged to entice customers on this bridge.

Go inside to really appreciate this 500-year-old technological masterpiece.

Thousand-year-old Viking runes adorn an ancient Greek lion at the entrance to the Venetian Arsenal.

Medieval town turned hippie commune, once home to the secret foreskin of Jesus Christ.

2300-year-old Roman road connecting the empire.

Ancient ruins hidden underneath a modern luxury hotel.

The ruins of the largest gladiatorial school in Rome are largely hidden under modern streets.

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

A small cell adjacent to this church was once the bedroom for a renowned saint.

The remains of this 2nd-century Roman temple are incorporated into a modern building.

More sculpture than building, this architecturally significant temple was built on the spot of Saint Peter's crucifixion.

This statue is the only female representation of Rome's "talking statues."

This is the oldest Roman-made bridge in the city still existing in its original state.

If you want to talk to the Pope you will have to stare down this surreal vision of Jesus rising from a nuclear hell.

Historic fortifications form the boundary of Vatican City, but it’s not entirely surrounded by walls.

The ruins of an ancient stadium that hosted gripping chariot and horse races.

The fragmented remains of a massive public bath connected to the city's water supply.

A New York–based physician returned home to Spain to build his own elaborate monument to Christopher Columbus.

This quaint Spanish village agreed to be painted blue as a marketing stunt but found that they preferred it that way.

One of the most spectacular bridges in Spain spans a narrow chasm that divides the city of Ronda.