The Vigna Cassia catacombs located next to thel Parco Archeologico Neapolis, owe their name to the family that owned the vineyard (at the time of discovery), which was located above the catacombs themselves.
They were found in 1852 during excavations by the Commission of Antiquities and Fine Arts, which at the discovery of steps carved into the rock that led to about 15 meters below street level, decided to deepen the research. After the excavations they discovered that the steps continued to a depth of 25 metres and that they led to the beginning of a series of tunnels.
The Catacombs of Vigna Cassia are considered the largest in Sicily, the beginning of their construction dates back to the third century AD, were active from the second half of the fourth century AD and presented themselves as a real cemetery consisting of a ipogeo of communities, but also five private hypogeums (intended for individual burials).
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.