My favourite Fellini film is still La Strada, Bicycle Thieves is a total masterpiece from De Sica, and as for Rossellini, Rome Open City is a landmark in neo-realism. I'm less keen on Antonioni, but obviously Blow-Up, The Passenger, Red Desert, etc are singular works.

Visconti is another major favourite of mine (The Leopard, Rocco and His Brothers, etc). Also don't forget Sergio Leone and also Sergio Corbucci (whose spaghetti westerns are less well known, but brilliant in their own way - Django, The Great Silence, etc). And don't forget Dario Argento either! I'm a huge fan of Suspiria, The Bird with the Crystal Plumage, etc.

I'm barely scratching the surface, but yes, Italian cinema has a rich history of great artists and masterpieces. :)