This statue was given to France by the United States to commemorate the centennial of the French Revolution.

An "inside out" building in the historical center of Paris, featuring Europe’s largest modern art museum.

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

The vast, legendary catacombs hold secrets much stranger than stacked bones.

A monumental fountain in Rome features a large statue of Moses that has been criticized for centuries.

An 18th-century post box used to alert the church of sick and ailing foreign pilgrims.

This one-of-a-kind Roman arch is not actually dedicated to the god Janus.

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

The only remaining arch of the oldest stone bridge in Rome stands in the middle of the Tiber.

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

This small, ancient Roman temple was once a church dedicated to the patron saint of penitents.

An 18th century fountain and two columns are all that remains of Rome's forgotten river harbor.

This large, circular tomb is the final resting place of the first emperor of Rome.

Ancient ruins hidden underneath a modern luxury hotel.

The "Greatest Sewer" of ancient Rome is one of the oldest sewer systems in the world, and is still in use.

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

Hidden in this modern shopping center is a relic of 16th-century capital punishment.

A roadway designed for a visiting monarch.

A quartet of brightly colored mythical beasts stand sentry at this gateway.

One of the first monuments dedicated to the accomplishments of the great Vice Admiral, Horatio Nelson.

A sculpture dedicated to the Roman history steeped in a Scottish town.

Glasgow's own "tipsy" temperance monument.

This monument is dedicated to a young boy who survived a disaster that forced Edinburgh to reevaluate its building codes.

This mundane post marks the old location of the city's main postal hub.