Festival du Monde Opens Paris Observatory for Heritage and Urban Astronomy Visit

On Saturday, September 19, the Observatoire de Paris opened its doors for an exclusive visit as part of a Festival du Monde program. The event combined a heritage walk through the historic institution with urban astronomy, presenting science in an open-air setting. The visit was framed within the Festival du Monde's broader series of cultural itineraries. No additional details about specific speakers, exhibitions, or astronomical activities were provided in the source. The date of the event is September 19, and the venue is the Observatoire de Paris. The Festival du Monde organized the parcours that included this stop. The source article was published by Le Monde on September 21, 2026.