Fort Énetis a fortification in the in Charente-Maritime, Nouvelle-Aquitaine, France. It is located on the Pointe de la Fumée, the roadway extending from the city of Fouras, between Fouras and Île-d'Aix, and can be accessed from there at low tide.
Fort Énet formed a line of fortification with Fort Boyard and Fort de la Rade on Île-d'Aix, designed to protect the arsenal of Rochefort from Royal Navy incursions. The building of the fort was started in 1810 by Napoleon I, following the devastating 1809 Battle of the Basque Roads.
The Fort can be reached on foot at low tide, and can be visited.
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.