According to this website a fortress dating back to before King David has been discovered in Jerusalem, read it at http://worldtruth.tv/massive-3800-year-old-fortress-uncovered-in-city-of-david%E2%80%8F/
According to the article, referring to 1 Samuel 5 in the Old Testament, “King David conquered the “Zion Fortress” from the Jebusite king and his men. The Spring House raises the possibility that it is the same impressive fortress, into which King David’s men entered as they were conquering Jerusalem from the Jebusites. At the beginning of Kings I, Nathan the prophet and Tzadok HaKohen describe King Sholomon’s coronation as taking place “on Gihon”. This ceremony took place, researchers believe, at the heart of the Spring House – over the gushing Gihon Spring.”
Not only is the Bible record true, but here we have clear evidence of things that happened thousands of years ago which are referenced in the Bible. King David was a real person, and although this discovery does not prove his existence, it is good to know that this place was probably the one that King David entered when he took Jerusalem from the Jebusites -- being given the city by God because King David followed God.