Cities are the greatest creations of humanity.
Unlike villages and even small towns which often show nature and human creations alongside one another cities tend to be dominated by human construction from the very ground that is walked on to the buildings that reach up into the skies. A vibrant healthy city is one that is always changing and evolving. A good city is constantly changing and evolving along with the people who live and work in it. After all a cities needs today are very different from 10, 20 50, 100 years ago although one of my favourite things about a city is being able to see parts of its history alongside its present and future self.