A 16th-century fountain marks the site of a lost medieval cemetery once filled with mass graves.

This former “ante-chamber to the guillotine” has been refurbished to illustrate the brutal history of French justice.

The narrowest street in Paris.

The very center of Paris is surrounded by a bevy of strange good luck rituals.

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

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

An ancient octagonal weather station named for the eight Greek gods of wind.

This gem is often wrongly overshadowed by the larger, newer Metropolis church in Athens.

Legend says this sacred tree was a gift from goddess Athena.

This small 16th-century church in Athens is almost entirely surrounded by a modern building.

Heralded as the world's first theater, these ruins are often overlooked as they reside in the shadows of the Acropolis.

The home of Greece’s national poet sits crumbling in the middle of a popular tourist district.

These artifacts were discovered during the construction of the airport, with some dating back to the Neolithic period.

A quirky bookstore hidden beneath a sea of whitewashed Greek villas.

This black sand beach was crafted from volcanic explosions including the historic Minoan eruption.

The bomb-ravaged remains of of a colossal Neptune.

This amazing medieval fortress stands atop a promontory along the famous Cinque Terre.

This tiny chapel withstood a massive mudslide and flash flood.

Five candy-colored villages on the Italian Riviera.

The only visible reminders of an elaborate engineering project that kept the tower from reaching the tipping point.

First founded in 1472, this is the oldest bank in the world. Its history may explain why we call financial institutions "banks."

A dismembered holy head stares out from her beautiful reliquary at the St. Dominic Basilica.

These medieval skyscrapers dominate the skyline of this small Tuscan town.

The mummified relic of St. Antoninus.