Observatoire de la Côte d'Azur (Mont Gros)

The Observatoire de la Côte d'Azur on Mont Gros overlooks eastern Nice from Boulevard de l'Observatoire, in the Provence-Alpes-Côte d'Azur region of France. It was founded in the late 1870s by the banker Raphaël Bischoffsheim, who funded a private research institution, and the buildings were designed by Charles Garnier, the architect of the Paris Opera. Work began in 1879 and the observatory entered service in the 1880s. The site is distinguished by Garnier's domes and his ornate architecture, and by the Eiffel-built dome of the Great Equatorial, a refracting telescope with a 76-centimetre lens that was among the largest in the world when it was installed in 1886. Further domes house smaller historic instruments. The visit covers the telescope domes, the library with historic instruments, the meridian room and the gardens. The observatory was donated to the University of Paris in 1900 and later became part of the national research network, and it remains an active research centre within the Observatoire de la Côte d'Azur. Restoration has been carried out on the main domes and the historic buildings, which are listed as a historic monument. The visit has a guided, thematic character, with explanations of the instruments, the history of the institution and the astronomy done there. Public visits are guided only, at set times: Wednesday at 2:00PM and Saturday at 10:00AM and 2:00PM, with extra slots on weekdays in zone B school holidays. Online registration is required at oca.eu/visites. Admission is EUR 12, with EUR 10 for seniors and Métropole residents, EUR 6 for students and free under 6. A visit lasts around two hours. The hilltop site is reached by bus or car, as the walk is long and steep, and some historic rooms involve stairs.