Why Italy - What are some off the beaten path activities in Rome, Italy?

What are some off the beaten path activities in Rome, Italy?

What places in Rome are very cool, yet have not been totally discovered yet?

crypt of the capuchian monks on the via veneto
foro italico (stadio dei marmi and the history of the italian empire and fascism in a mosaic-paved road just in front of the olympic stadium).
Adam H, please report Mrs Mulah, she has been doing this everywhere. Its harrasment.
Walk into any of the millions of churches. They look not really that magnificent on the outside, but inside they are breath-taking. Just wander and let Rome show you the way.
Homer already mentioned Santa Maria della Concezione dei Cappuccini which is pretty interesting - especially the crypt: http://www.cappucciniviaveneto.it/cappuccini_ing.html Other places that could be possibilities include: the Museum of the Souls of Purgatory http://www.initaly.com/regions/museums/michael.htm The view through the keyhole at the Knights of Malta in Piazza dei Cavalieri di Malta http://www.trekearth.com/gallery/Europe/Italy/photo238290.htm Take Via di Santa Sabina from Circus Maximus to get there. Go see the Pyramid: http://www.aviewoncities.com/rome/pyramidofcaiuscestius.htm The National Pasta Museum: http://www.10best.com/Rome,Italy/Attractions_&_Activities/Museums/22324/National_Pasta_Museum_Rome/
Bocca della Veritas Castel Sant'Angelo Mamertime Prison Wander around (daytime only) Traste Tivere area. Old Jewish quarter.