I must say the UVA campus is the most pleasant one I’ve seen so far. Penn was nice but it suffers from being crushed by the weight of the city. UVA is open, wide and feels much more relaxed than Penn. UW-Madison’s campus didn’t have the charm of older campuses. The Université de Montréal’s campus (where the École Polytechnique de Montréal was located when I was studying there) is unremarkable. (Ditto for UQAM.)
I haven’t seen any European campuses so I can’t compare with those…