The wall of the ancient city of Kos has the shape of a ring with a perimeter of about 4 kilometres. The wall surrounded a residential area and also a large area of the south of the city with fields and gardens. Parts of the northern side of the wall can be visited today at the Limenis archaeological site. It shapes a crooked line which follows the curve of the coast of the harbour. It’s made of big rectangular stones and has a height of 4 of these stones. The two towers were found in this area, one a rectangular the other a semi-circle.

Its construction dates back to the 4th century BC during the establishment of the new city. It was destroyed by an earthquake in 142BC and was never re-constructed.