Pointe du Hoc is a promontory with a 30m cliff overlooking the English Channel. During World War II it was the highest point between Utah Beach to the west and Omaha Beach to the east. The German army fortified the area with concrete casemates and gun pits. On D-Day (6 June 1944) the United States Army Ranger Assault Group assaulted and captured Pointe du Hoc after scaling the cliffs.
Six French-made 155 mm howitzers dating from the First World War are set up on a plateau that ends abruptly in rocky cliffs.
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.