Tough to say, if they’re not well known.
I think every secluded place is beautiful, even if it’s not on a tourist map.
For instance, when I visited Venice for the first time, I was amazed. It was raining, I was really cold, and yet I was so amazed by the city! So I went to visit the most touristy place in Venice, piazza San Marco. But even though there was plenty to do there, after a while I just went for a walk, away from the crowds, away from the touristy landmarks. I found a park, and beautiful streets and admired great buildings.
I think if you see the beauty in everything, you’ll love visiting any location in Italy.