A theatre built to house the rowdy Oxford graduation ceremonies became the stage for a debate about God's existence.

This 11th century tower is said to be the oldest building in Oxford.

These quintessentially English stepping stones were built for Victorian tourists.

Centuries of human activity have forged an eerie landscape of ruins and craters on an exposed and windswept hilltop.

A copy of the famous statue can be found in this Florence piazza, along with one of the most breathtaking views of the city below.

This amazingly well-preserved villa just outside Pompeii boasts rare examples of ancient Roman paintings.

Ancient snack bar of the Roman Empire re-opened.

The last moments of the ill-fated Pompeiians, frozen forever in plaster.

Every day is like Christmas on this street where the traditional Neapolitan nativity scene comes to life.

This shining multicolored metro station deep under Naples is said to be the most beautiful in Europe.

The once forbidden "secret cabinet" of erotic art from excavations of Pompeii and Herculaneum.

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

The big toe of this towering monument to a Croatian national hero is worn from years of superstitious rubbing.

Now harmless, this looming post struck fear into the heart of medieval troublemakers.

An ancient knight and a symbol of the city's freedom.

When a supermarket opened up shop within a medieval building it became protected by UNESCO on a technicality.

This picturesque medieval monastery guards a small trove of historic treasures.

The complex has been abandoned since the Croatian War of Independence, barring a stint as a set for 'Game of Thrones.'

Large, airy hallways hide within an impenetrable fortress that beckons urban explorers.

A musical instrument played by the sea.

A striking public sculpture representing the period of martial law in Communist Poland.

In the center of Wrocław's old meat market stands a somber tribute to the city's livestock.

The silly symbol for an underground protest group is now scattered around the city.

This 22-floor tower's Skydeck offers panoramic views of Amsterdam.