Rome has some of Italy's busiest sites and sights, but also many where you can be almost alone...
This table shows the 2011 visitor count at places within the capital's boundaries that come under
the auspices of MIBAC, the Ministry of Arts and Culture - although it doesn't include the Vatican,
nor any churches other than (at the very top) the Pantheon!
Source _ http://www.statistica.beniculturali.it/Visitatori_e_introiti_musei.htm