The area around the gallery is quite formal with trimmed gardens and statuary. The museum was closed for renovation the last time we were in Rome and we were happy to be able to see works of art by Bernini, Caravaggio, Raphael, Titian, and Canova. We were not permitted to photograph inside so here is a link to see some of these amazing works:
http://www.galleriaborghese.it/borghese/en/edefault.htm