Heritage actors will offer a light on the theme of sustainable heritage through focus on a selection of objects by places. A route chosen in the main heritage sites and in the city will answer several questions: was the D system practiced in antiquity? What is the impact of industrial development on the environment and landscapes? Is it possible to do geology in cities? How can we know and transmit works to future generations? .... The route will take you through the Apt Museum, the Cathedral, the Municipal Archives and the former Archaeological Museum. The thread will be provided by the actor Jean-Marc Fort, who will animate the course and punctuate it with readings of historical texts.