The subject of this work is the Favela Tourism, which is taking place within the poor communities of Rio de Janeiro. Our goal is to describe its mechanisms and to understand the limitations of this economic activity in the context of a discussion about sustainable development in poor urban communities. The so-called Favela Tourism, as we know, has been practiced in the city of Rio de Janeiro since the early nineties and has increased its volume during the last five years. The tours offered by the agencies are progressively invasive and very similar in scope. The visits include touristic walks through alleys and trails, with the purpose of exploring a poverty and violence show. Many factors contribute to generate interest in this kind of Tourism, such as the marketing created by the touristic agencies and mass media communication, particularly the movie City of God. As a conclusion we discuss some ideas for Tourism within the poor communities of Rio de Janeiro not based on prejudice and with the understanding that this activity must enclose the inhabitants of those communities in order to be successful.