An Israeli archaeologist, Eli Shukron, believes he has identified the citadel that King David captured from the Jebusites. Also called the Citadel of Zion and the Spring Citadel, the location is in east Jerusalem and has been opened as a tourist exhibit with interpretive materials and videos.
The massive fortifications surround a spring with a shaft that diverts water to a pool, thought to be the water source for the Jebusite city. It was through such a shaft that David was able to penetrate the citadel. The story is recounted in 2 Samuel 5:6-9 2 Samuel 5:6-9  And the king and his men went to Jerusalem to the Jebusites, the inhabitants of the land: which spoke to David, saying, Except you take away the blind and the lame, you shall not come in here: thinking, David cannot come in here.
 Nevertheless David took the strong hold of Zion: the same is the city of David.
 And David said on that day, Whoever gets up to the gutter, and smites the Jebusites, and the lame and the blind that are hated of David's soul, he shall be chief and captain. Why they said, The blind and the lame shall not come into the house.
 So David dwelled in the fort, and called it the city of David. And David built round about from Millo and inward.
American King James Version×.
However, other archaeologists disagree on the identification of the site and believe more research is necessary before drawing final conclusions (“Israeli Archaeologist Says He’s Found Citadel Captured By King David,” Associated Press at FoxNews.com, May 6, 2014).
Despite the archaeological disputes, a few things are certain. There was a city that King David conquered, that is Jebus, now known as Jerusalem. There is undoubtedly a site through which he conquered the city.
Most importantly, Jerusalem is not just an ancient city with some interesting history, it will be the site of world shaking events yet to come. God keeps his eye on what occurs there, and when the time is right Jesus Christ will return and rule the world from Jerusalem.