"Town" is the 8th topic for the blog project 52Games. In addition to Sim City also CityVille comes into my mind.

Exactly, that is the facebook game nobody plays  but it has millions of players.

In CityVille you create your own town with homes, businesses, ports, bridges, parks, skyscrapers and others. At the begining you only have a few buildings to choose from but it grows with your level. Of cause you can invite and visit your friends like in any other facebook game.