וַיִּלְכֹּ֣ד דָּוִ֔ד אֵ֖ת מְצֻדַ֣ת צִיּ֑וֹן הִ֖יא עִ֥יר דָּוִֽד׃
Nevertheless David took the stronghold of Zion; the same is the city of David.
Read Kabbalistic (mystical) interpretations of II Samuel 5:7: Zohar and classical Jewish mystical sources, free online.