A picture-heavy article at https://archaeologynewsnetwork.blogspot.co.uk/2016/09/prehistoric-fortifications-found-in.html (https://archaeologynewsnetwork.blogspot.co.uk/2016/09/prehistoric-fortifications-found-in.html):
Quote...several fortified settlements have been discovered which were built in the early to mid-4th millennium BC on volcanos in this region and are therefore among the earliest fortifications in Southwest Asia.