Nebuchadnezzar king of Babylon came, he and all his army, against Jerusalem, and they camped against it and built siege works all around it (2 Kings 25:1).
The word “siege works” should probably be taken to refer to a siege wall. No evidence of the Babylonian siege works against Jerusalem have been found, which is hardly surprising given the great amount of building and rebuilding of the city that has taken place since then. The siege wall in this photo is from the Roman siege of Masada (ca. AD 71–74). The portion in the foreground of the photo has been rebuilt in the modern era. Such walls were intended to prevent anyone from coming or going, and it seems likely that Nebuchadnezzar’s siege wall would have been similar.