I was unlucky with some of the famous sites in Rome. One of them was the Trevi Fountain because it was closed for restoration. I still went there to see it even though it was barricaded (so did 100 people) but I still saw the glimpse of it's beauty. I'm sure it is x1000 more beautiful once the water is flowing.
I loved that they scrubbed it clean and it's pretty much blinding white when you see it in person. No stone was left untouched by the restoration.