Roma, início dos anos 60. O jornalista Marcello (Marcello Mastroianni em desempenho memorável) vive entre as celebridades, ricos e fotógrafos que lotam a badalada Via Veneto. Neste mundo marcado pelas aparências e por um vazio existencial, frequenta festas, conhece os tipos mais extravagantes e descobre um novo sentido para a vida.
During the Spanish occupation of Naples, the people led by Tommaso Aniello - known as "Masaniello" - plot against the Viceroy. The Viceroy's son, under another name, has a son from Masaniello's sister, but his father has already planned a marriage for him with a Spanish patrician against his wishes.
Called to perform at the Scala, a young baritone begins a transatlantic romance with a famous pianist. The singer, having been skewered by a critic after his last performance in Milan, attempts to find a way to win over the audience and the critics, while wooing his love interest.
An American starlet inflames two Italian peasants who forget about their respective fiance's. One of them even thinks of marrying her and begins to plan for the engagement banquet. When the girl decides to live the countryside harmony reigns again.