"La Strada" is perhaps Fellini's greatest contribution to neo-realism, a film making employing mostly non-actors, shot on actual locations rather than studios and generally dealt with hardship and poverty and the like, gained popularity and won critical acclaim in the 40's through the early 50's. Expectedly, the film is sad but more importantly, it introduced the world to the genius of Fellini. If you want to follow his works, I recommend "La Dolce Vita", "Amarcord" and what I believe his greatest work is - "8 1/2". Since you mentioned that you like "Juliet of the Spirits" (which I do, too), you might want to check his other "dazzling" works like "Satyricon", "City of Women" and "And the Ship Sails On" which I think is his most enjoyable work. Good luck!