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

The video game-themed street art first popped up in the French city.

This life-size replica of the Statue of Liberty's flame is also a tribute to Princess Diana by default.

Medieval museum built over Roman baths that features famous tapestries of a lady and a unicorn.

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

Eighty million natural history specimens call this gargantuan museum home.

The world's first zoo for microbes collecting the horrible and wonderful things living on and around us.

Cat art as far as the eye can see.

Gladiators once walked this ancient, subterranean passage.

A Byzantine church containing the holy remnants of three saints sits atop the site of an ancient temple.

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

Overlooking the harbor is a beautiful neglected mansion guarded by two Egyptian sphinxes.

A sprawling collection of books and manuscripts about ancient Greece that would have put their famed libraries to shame.

The oldest standing Byzantine church in Athens is tucked within a monastery in the middle of an upscale shopping district.

This abandoned Greek island was the last active leper colony in Europe.

Where commuters walk through remnants of an ancient Greek necropolis.

The ruined doorway is a portal to the building's turbulent and torturous past.

Large collection from the 3rd millennium BCE.

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

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

The ruins of an ancient Roman tomb hidden in the basement of a trendy clothing store.

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

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

A minotaur, a labyrinth, and a dubious restoration pull in visitors from around the world.