Fort Boyard (fortification)

Fort Boyard is a 17th-century fortification located on an island off the coast of France. Built to protect the entrance to the Gulf of Poitou, the fort features bastions, curtain walls, and a central keep. Its strategic location and robust design made it a formidable defense against naval attacks, and it played a significant role in the region's military history. Today, the fort is a popular tourist attraction and a testament to the engineering and architectural skills of its time.