Château de Mauvezin, occupied since protohistory, was transformed into a castrum in the Middle Ages and later into a castle. The castle was built by Gaston Fébus (also Phoebus) around 1380. Following the merging of Bigorre into the Kingdom of France in 1607, it fell into disuse and was dismantled piece by piece, its stones being used for other buildings.
Today the castle is being restored and houses a historical and folk museum of Bearn and Bigorre.
The Walls of Constantinople are a series of defensive stone walls that have surrounded and protected the city of Constantinople (today Istanbul) since its founding as the new capital of the Roman Empire by Constantine the Great. With numerous additions and modifications during their history, they were the last great fortification system of antiquity, and one of the most complex and elaborate systems ever built. They were also the largest and strongest fortification in both the ancient and medieval world.
Initially built by Constantine the Great, the walls surrounded the new city on all sides, protecting it against attack from both sea and land. As the city grew, the famous double line of the Theodosian Walls was built in the 5th century. Although the other sections of the walls were less elaborate, they were, when well-manned, almost impregnable for any medieval besieger.