Observatoire de la Côte d'Azur (www.oca.eu). In a marvellous hill-country setting up above Grasse, its observation instruments include an interferometer unique throughout the world.Guided tours are held every Sunday at 15:15, 1 May to 30 September Prices: Adults € 6 - Children, students: 3 euros Info: 04 93 40 54 42.