The Umbrellas of Cherbourg
Castelnuovo's breakthrough role arrived with "The Umbrellas of Cherbourg" (1964), directed by Jacques Demy, in which he played opposite Catherine Deneuve. Nominated for the American Academy Award for Best Foreign Language Film, the film gained the attention of both film critics and the public, and won the Palme d'Or at the Cannes Film Festival in February the same year.