Sorry for being uninformed. I have purchased several travel guides but have not had time to read them entirely. Given the fact that this is my first trip, I have concentrated mainly on the typical tourist attractions such as the Vatican, Colosseum, Pantheon, etc. I've seen the Villa Borhgese museum mentioned alot on this forum and I know that you must make reservations ahead. I wonder what I am missing by not concentrating on this site. Is it a must see on a first trip?