From the World Heritage inscription:
From the Neapolis founded by Greek settlers in 470 B.C. to the city of today, Naples has retained the imprint of the successive cultures that emerged in Europe and the Mediterranean basin. This makes it a unique site, with a wealth of outstanding monuments such as the Church of Santa Chiara and the Castel Nuovo.
Naples is great city that is high on my list of places to return to. I was only able to spend several hours walking around the city, but I enjoyed the time I had.
View my complete list of UNESCO World Heritage Sites