To see a city in your dream, signifies a sense of community and your social environment. If you dream of a big city, then it suggests that you need to develop closer ties and relationships. You are feeling alienated and alone. To dream that you are in a deserted city, indicates that you feel rejected by those around you. To dream of a city in ruins, denotes that you are neglecting your social relationships and allowing them to deteriorate. To dream of an underground or underwater city, represents your unconscious and how through deeper understanding of yourself, you find commonality and shared experiences with others.