Who has ever been able to explain where love comes from? What is it that makes two people feel attracted to each other? It is a complex of physiological and psychological processes, inexplicably beautiful, uplifting and down-to-earth. It is much the same with cities, though their allure is easier to explain. We take away with us the abiding impressions of buildings, streets, squares and sights, and of course, the atmosphere, the feel of the place.