This historic stone gate tower is now just a lonely relic in the middle of a swamp.

700 iron sculptures crammed into a Mediterranean park.

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

A unique underground structure dating back to the 1st century BC.

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

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

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

This stunning natural double arch, the largest in the Alps, went undiscovered until 2005.

The people's champion of the French Revolution was so overcome by grief at his wife's death that he exhumed her in the dead of night to make one final replica of her face.

Located in the house where Gustave Flaubert was born, this odd museum has more to do with medical grotesquery than the Western novel.

A former milk-delivery driver and his wife turn their home into a glimmering mosaic.

The great Italian Renaissance painter was laid to rest here in the Chapel of Saint-Hubert.

A once drab public housing estate is transformed into a colorful gallery of trompe l’oeil murals.

The experimental test tracks of a retro-futuristic monorail still stand in the French countryside.

Artist and musician Will Menter creates musical sculptures.

Perhaps the most beautiful of preserved saints, with a little help from Paris.

Long tunnels run under the ancient chariot racing circuit to the tower.

An archaeological museum squeezed into a narrow 15th-century gate tower accessed only by a spiral staircase.

Abandoned tunnels dug for the once-thriving sea salt industry on the coast of southern Spain.

This abandoned, turn-of-the-century astronomy hub is now the subject of more photographs than it ever took.

An ancient Roman theatre restored to its former glory in the Spanish city of Cartegena.

An impressive display of ships and artifacts from the ancient Mediterranean maritime trade.

Bacteria and algae give the salty water its bubblegum hue.

The two massive guns that defended Cartagena Bay.