So na Caçana dates from the Talayotic period (1000-700 B.C.) and remained occupied until the arrival of the Romans. It contains up to ten large structures. At first it was thought to be a settlement but archaeological excavation work uncovered up to three taula enclosures, which suggested it was more likely to have been a sanctuary and ceremonial site that may have been used by more than one community.The main features of the site are the central monument, the entrance to which was closed off in the 1st century B.C., and the taula enclosure on the west side. The capital of the taula has not survived, but you can see an unusual pilaster at the back. Also of interest are the niches in the perimeter wall. Archaeological excavation work inside the enclosure has uncovered evidence of the rituals carried out in this type of enclosure. There is also a necropolis in the area, comprising two natural caves and three underground burial chambers.
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.