The Felsenkirche, a church built into a natural niche in the rocks, rises high above the houses of Oberstein. Wyrich IV of Daun-Oberstein had it constructed in the years 1482-1484. Behind it, a wall of rocks rises steeply upwards; and under it, the houses of Oberstein nestle into the slope. On account of its prominent location, the church has become a symbol of the city. It can be entered only through a tunnel which was dug into the rocks.
The church’s greatest treasure is the medieval winged altar. It was created around 1400 by an unknown painter, the “Master of the Mainz Mocking”.
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.