Frascati, the place where you can visit the splendid Aldobrandini Villa.
Grottaferrata, you can admire the San Silo Abbey.
Castel Gandolfo, the Pope's summer residence.
Nemi, with its blue and green panorama and its lake.
Ariccia, well known worldwide  for the "fraschette": old traditional wine cellars now renewed places where you can have wine, cheese, olives, porchetta and delicious romans plates. During the summer
the "fraschette" are full of people having food and sitting on tables outside the cellar