3,800 Old. From here King David conquered Jerusalem

After 15 years of archaeological digging in the City of David, this site is open for visitors. King David conquered this "Zion Fort" from the Jebusim (Shmuel B chapter 5). King Solomon שלמה was anointed here. The place functioned until after the end of the Iron Age and the destruction of the first Temple. The fortress protected the Gichon spring and provided safe passage from the city (Jerusalem). The walls are 7 meters (22`) thick. This is the largest fortress discovered in Israel from prior to the King Herod era.