The architectural heritage of Lyon is representative of all periods from the Middle Ages until today, including significant Gallo-Roman elements. Furthermore, the town planning models and the architectural styles developed and improved over the centuries and continued to evolve without interruption. With its unusual town planning, the city has always been characterised by important human occupation, still evident today. The city of Lyon coordinates action programmes that concern all the heritage chains, in close contact with the services of the metropole of Grande Lyon, the region and the State. The buffer zone, defined around the perimeter of the historic site, encourages the cultural and heritage reading of the territory of the contemporary city beyond the historic site.