Aladzha Monastery is a medieval Orthodox Christian cave monastery complex in northeastern Bulgaria, 17 km north of central Varna and 3 km west of Golden Sands beach resort, in a protected forest area adjacent to the Golden Sands Nature Park.
The monastery caves were hewn into a 25-m high vertical karst cliff near the upper edge of the Franga Plateau on several levels. The complex includes two small nearby catacombs.
Dedicated to the Holy Trinity, it was an active hesychast monastic community of the Second Bulgarian Empire since the 12th century and perhaps survived until the early 18th century. Nearby, remains of a 5th-century cave monastery have been found.
A cave monastery may have existed not far from the modern monastery Aladzha, near Varna. Its early dating to the fourth century is secured by fragments of glassware, but coins of Justinian indicate that the complex may have still been in use during the 500s.
Today, the grotto is a popular tourist destination. Its present name appeared in the late Ottoman period; Alaca (Turkish for motley) referred to its colourful murals, now almost destroyed. Thematic light shows are being staged in the summer.
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.