A Talayotic period settlement (1000-700 B.C.) in Trebalúger was a spectacularly large talaiyot; it is 28 metres in diameter at its widest point. It has an elliptical layout and was built on a high rocky outcrop on the site of an earlier structure from the Naviforme period dating from 1350 B.C., with the bases of the pillars still preserved inside. At the front of the monument, near the entrance, you can see the remains of a ramp that led up to the top of the talaiyot. Around the outside you can see the walls of a polygonal structure, also from the Talayotic period, which has been damaged by the lime kiln built over it at a later date.
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.