Fontana di Trevi is, as it should be, one of the most visited landmarks in Rome. Go see it. It's worth the blind stumble through winding stone streets and alleyways. But do so at night AND in the rain and you will be rewarded not only with the sight of the stunning fountain but with a scene like something out of a Fellini movie. This is when the Trevi Fountain is at her most beautiful and most magical self.