The Makelaria Monastery is a 6th-century Eastern Orthodox monastery located in the Peloponnese, Greece. It lies on a big rock near the villages of Lapanagoi, at a distance of 30 km from the town of Kalavryta. The monastery, one of the oldest in Greece, was founded in 532 AD and is dedicated to the Dormition of the Theotokos.
It has a small Byzantine church with a beautiful wooden-carved screen, on which the icon of the Virgin is placed. This is an authentic Byzantine art piece, with a distinctive feature: wherever you stand, the Virgin's eyes give you the impression that they follow you. The holy icon of the Virgin, along with a pot full of olive oil, was found in the 15th century in an area close to the Monastery.
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.