This ancient theater was once the home of fierce gladiatorial battles.

The famous winding walk at Chartres is surrounded in mystery and myth.

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

Ancient paintings known as the "Sistine Chapel of Cave Art."

A series of abstract, silly sculptures represent the works of a great modern classical composer.

The ruins of a Duke's bucolic dream, where camels once roamed alongside "Dutch" windmills and faux-Italian vineyards.

The water-powered carriages are long gone, but for over a century this funicular railway has been the fastest route to the highest point in Paris.

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

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

A horde of stray cats rule in this secluded Parisian cemetery under a bridge.

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

A nearly 500-year-old sculpture depicts a man eating a sack of babies, and no one is sure why.

There is only one place in the world where the corners of four nations come together.

Combing through this David Livingstone tribute will escort you on adventures through the looking glass.

In 2400 BC, two male hairstylists decided to spend eternity together. But maybe they were just friends?

A subterranean necropolis blending Egyptian, Hellenic, and Roman traditions and art styles.

This fortress was built using the last surviving stones from the Lighthouse of Alexandria, one of the Seven Wonders of the Ancient World.

The lost library of Alexandria, revived as a spearhead of cultural preservation.

Slum Settlement Filled With Mountains of Garbage.

The medieval center of the Islamic world was also once the seat of Saladin's sultanate.

The massive cave church of Cairo's Zabbaleen community is one of the largest Christian churches in the Middle East.

Mosques carved from coral and dozens of well-preserved stone structures fill this 500-year-old Swahili trading center.

Over the course of its history, this tiny island has held enslaved people in transit and served as a quarantine zone. Today, it's a giant tortoise sanctuary.

This slowly crumbling mansion was home to one of East Africa's richest and most powerful slave traders.