The fast urbanization of the last decades has developed specific areas of poverty and insecurity in cities across the world. Urban poverty is a general phenomenon. It takes different forms in different countries or continents, called barrios, favelas, or slum districts. Some have thought it was a temporary situation and that economic development would help overcome the problem. But it is not the reality and some neighbourhoods around the world concentrate social exclusion. Caracas, Venezuela, is an example: its slums and skyscrapers are a hostile habitat for inhabitants and a fertile ground for...