Cordouan lighthouse is located 7 kilometres at sea, near the mouth of the Gironde estuary in France. At a height of 67.5 metres, it is the tenth-tallest 'traditional lighthouse' in the world.
The Tour de Cordouan, the 'Patriarch of Lighthouses', is by far the oldest lighthouse in France. It was designed by leading Paris architect Louis de Foix, and is something of a Renaissance masterpiece, an amalgam of royal palace, cathedral and fort. Started in 1584 and finished in 1611, it still stands today. Three stories were added in the 18th century.
It was listed as a historic monument in 1862, and recognized by UNESCO as a World Heritage Site in 2021.
References: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.