What is it that makes a city important not only to its inhabitants, but also to the people who stop by simply as tourists or even just passers-by?

Is it the geographic location that makes it an important station on the way to other destinations? Is it, maybe, the richness in cultural and historical sites, public parks and places for enjoyable walks? Or is it the rich nightlife, the hosting of many festivals, music, film and sport manifestations, the existence of a great number of restaurants, cafes and hotels; the possibility to have an nice and quiet relaxation alongside places for wild parties? Or has it something to do with the people who live in it and who make it the way it really is, open and attractive, secretive and diverse, marry and accessible?