Kyiv-Pechersk Lavra is a historic Eastern Orthodox Christian monastery which gave its name to one of the city districts where it is located in Kyiv.
Since its foundation as the cave monastery in 1051, the Lavra has been a preeminent center of Eastern Orthodox Christianity in Eastern Europe. Together with the Saint Sophia Cathedral, it is inscribed as a UNESCO World Heritage Site. The Lavra is not only located in another part of the city, but is part of a different national sanctuary than Saint Sophia Cathedral.
The Kyiv Pechersk Lavra contains numerous architectural monuments, ranging from bell towers to cathedrals to cave systems and to strong stone fortification walls. The main attractions of the Lavra include the Great Lavra Belltower, and the Dormition Cathedral, destroyed in World War II, and fully reconstructed in recent years.
Other churches and cathedrals of the Lavra include: the Refectory Church, the Church of All Saints, the Church of the Saviour at Berestove, the Church of the Exaltation of Cross, the Church of the Trinity, the Church of the Nativity of the Virgin, the Church of the Conception of St. Anne, and the Church of the Life-Giving Spring. The Lavra also contains many other constructions, including the St. Nicholas Monastery, the Kyiv Theological Academy and Seminary, and the Debosquette Wall.
The Kyiv Pechersk Lavra caverns are a system of narrow underground corridors (about 1-1½ metres wide and 2-2½ metres high), along with numerous living quarters and underground chapels. In 1051, the monk Anthony settled in an old cave in a hill near the Kyiv Pechersk Lavra. This cave received additions including corridors and a church, and is now the Far Caves. In 1057, Anthony moved to a cave near the Upper Lavra, now called the Near Caves.
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.