The Colonne di San Basilio (Columns of St Basil) are an ancient Greek structure, which take their name from the mountain of San Basilio where they are located, in the territory of Lentini.
The summit of the mountain shows trances of ancient settlement from the prehistoric period, with clear traces of the postholes of a hut, probably belonging to the Casteluccio culture.
A little way away is the imposing structure itself, carved in the limestone rock and measuring 18 x 16 metres, with 32 columns designed to support rock slabs. Part of the structure has collapsed, but many of the columns remain standing.
The structure was later reused by the Byzantines, who converted it into a church. Some traces of religious frescoes are even visible on some of the columns, but they are not legible.
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.