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

This park on the outskirts of Rome boasts two ancient Roman aqueducts and a medieval tower.

This curious, round temple is the oldest still-standing marble building in Rome.

This ancient market is often referred to as the oldest shopping mall in the world.

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

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

This beautiful park on the outskirts of Rome protects the ruins of two colossal ancient aqueducts.

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

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

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

This demon atop the Notre-Dame de Paris looks utterly bored.

An small and easily overlooked archaeology museum chock full of Egyptian artifacts.

The pioneer of psychoanalysis spent the final year of his life here, still seeing patients on that famous couch.

These mysterious Viking chess pieces spent centuries hidden on a remote Scottish island.

This bewitching Babylonian goddess haunts a hallway of the British Museum.

The rotting skeleton of a shoreside fun fair that was destroyed by fire and storms still haunts the Brighton ocean view.

Regency-era excess on the English Coast.

The remains of an ancient bathhouse sit inside this aptly-named pub.

It's possible to walk inside one of the largest Neolithic tombs in Britain.

Europe's largest prehistoric mound – burial site of a legendary king?

The largest stone circle in the world has ended up bringing up more questions than it has answered.

Scattered throughout London are ancient remnants of the city's former bounding wall.

Famously misunderstood wonder of the ancient world

The first archaeological site discovered by aerial photography.