Abstract— The SAFETY project aims to create a system able to support rescuers such as fire fighters in presence of danger events, especially when they have to intervene in large buildings with many floors and rooms, with different access points, and with numerous users. In these cases, in fact, it is very important to provide a smart decision support system able to promptly guide rescuers to the critical points of the building where there is the certainty that there are users to be rescued or artworks to be kept safe, without wasting resources. In order to achieve this goal, an innovative system architecture based on the use of technologies enabling the Internet of Things including sensors, mobile devices, Cloud technologies, mobile Apps, and embedded devices have been designed and developed in the SAFETY project.