Legal and Illegal city, Formal and Informal city; they are notions (and realities) meaning a condition of urban duality. These realities are not only a consequence of globalization processes, but contain cultural and historical values, that are very important in a new theory of the Latino-American city and global city. This paper focuses on the analysis path of informal settlements in some towns of Andes, in order to discover so far and unexplored ways of life.