This 11th-century castle sits so low you can't see it behind the surrounding buildings.

This Parisian gem is one of the most incredible ethnographic museums in the world.

A beautiful ruin of a 14th-century Plantagenet castle built by a medieval mercenary.

This local emblem is the oldest and largest dragon tree in the Canary Islands.

A beautiful Victorian statue shows France's enduring love of the rhinoceros.

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

The castle was reconstructed to fit Kaiser Wilhelm II's romanticized vision of the Middle Ages.

A network of ancient Egyptian tombs built into the cliff face along the Nile.

The fierce beast perches atop a pedestal marking where the historic City of London gates once stood.

The compass on its front was a handy tool for 17th-century merchants who needed to know the direction of the wind.

Fortune tellers, snake charmers, poets, and storytellers all gather on this historic square in Morocco.

It took 40 years to build this Eden-like garden in Marrakech, later restored by Yves Saint-Laurent.

This garden houses the remains of the ancient Greek port of Marseille.

Deliberately hidden for centuries, the magnificent Saadian Tombs were eventually uncovered in 1917.

This triumphal arch celebrating the Sun King's conquest of Lille is a masterpiece of military architecture.

Tables of secondhand books fill the inner courtyard of this 17th-century stock exchange.

France's third-largest necropolis offers a peaceful respite from a busy port city.

Ancient ruins hidden underneath a modern luxury hotel.

Located near Cairo's El Korba district, the abandoned mansion continues to inspire mystery and rumor throughout the city.

These ruins reveal the remarkably intact layout of a Roman marketplace.

Made famous by 'Star Wars,' these troglodyte homes face an uncertain future.

One of the most well-preserved temples of ancient Egypt.

These Egyptian statues have survived for 3,400 years and were an acoustic wonder of the ancient world.

The eclectic observatory castle of a 19th-century astronomer and explorer.