A listed UNESCO “World Heritage” sites, the Chartres Cathedral had been experiencing a gradual decline in the quality of its immediate surroundings and was threatened with being unlisted. The study’s objective was to explore the area’s potential for regeneration, including both the city’s historical centre and the under-exploited potential economic opportunities, especially in terms of tourism. The project concluded on the need to deploy a rediscovery of the city’s history from the Roman era (with a small underground museum), and to put a new spotlight on public spaces to the benefit of pedestrians. The suggested method calls on a contemporary interpretation of medieval illuminated manuscripts, especially regarding the choice of plants: creepers and symbolic plants, and colours like vines, roses, lilies, apple blossoms, blue, red and more.