At Fenagh, two church ruins stand on the site of an earlier monastery founded by St. Caillin in the 6th century. The main ruins of the Gothic church have (among other features) an east window of unusual design and a relief-carved 17th-century penal cross. A number of standing stones in the vicinity represent the petrified bodies of druids who tried to expel St. Caillin from Fenagh.
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.