The Baños de Tenerías were a public bath. It is believed that these were built at the beginning of the 11th century, when Spain was under Moorish rule, and was one of the six Arab baths in the city. These offered the possibility of make purification baths for access to the Al-Dabbagin Mosque (the current church iglesia de San Sebastián).
It is divided into the living room bayt al-mash, the latrines, the cold room bayt al-bárid, the temperate room bayt al-wastani, the hot room bayt al-sajûn, the cistern and the qanat.
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.