NOma is a tool to help you understand and learn about the history of the mafia in Palermo. It offers a good introduction to the subject and provides useful information for tourists, students, and people interested in learning more about this terrible event that has marked Italian history. 

It is based on the memories of those who lived it and tells the stories of those who were killed or disappeared in the city. The stories are presented with the photos of the places where the crimes were committed and with the location of the events. It also provides information about the places where the mafia still operate, the people who are involved in the criminal activities, and the crimes committed in the past and present.