Perhaps the City of God is not so much a place in space, as a place in the heart.
Until I have been lured into the desert, until I have been brought in solitude to the very ground of my being, where I am beyond the grip of my surface self with all its plans and distractions, I am not able to hear the divine whisper. It is then I discover at the heart of things that my solitariness is transcended and that I am not alone.