This functioning parish church is also the site of many concert performances due to its wonderful acoustics.

Perhaps the most spectacular grotto along the Algarve coastline.

The ancient heart of Tunis is an enormous maze of narrow streets and alleyways.

Founded in 670, this ancient mosque is an architectural time portal.

The largest salt lake in the Sahara is mysteriously alluring.

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

This salt marsh in Southern France is as pink as the flamingos that inhabit it.

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

Walk through living pictures and music in the Cathedral of Images.

The mental institution where Van Gogh created some of his most famous work now allows guests to walk in the artist's footsteps.

Even France's favorite aquatic son Jacques Cousteau, couldn't get to the bottom of it.

This tiny cafe is one of the last meeting places of its kind, allowing revolutionaries a place to plot.

These medieval ruins have survived since the 12th century, even providing shelter from the Nazis.

From carts to cars, this leftover Roman bridge in France has managed to survive for centuries.

One of the largest ochre quarries in the world, hidden in a limestone landscape.

A Gothic cathedral created from volcanic rocks.

A natural arch carved by a river gave its name to the so-called "Cave of Forgotten Dreams."

A colossal sculptural lion built by the same man who designed the Statue of Liberty.

A copy of the Statue of Liberty greets visitors to the birthplace of Auguste Bartholdi.

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

This church sits upon a peaceful hill and a long, turbulent history.

An image of the legendary saint stands in the shadow of a cathedral she liberated.

The woman who helped save 15th-century France was born in this humble home.

This modern French ossuary contains the jumbled bones of 130,000 WWI soldiers.