prettiest house on campus (in my opinion) is the ZTA house here at NC State:
I'll try to find a picture of our Chi-O house on campus, it's one of the newer ones. Most of the houses closer to campus are older (with the exception of Sigma Happa and Pi Phi, which share either side of a duplex) and have ugly 70's architecture even though they've been redone inside. Further away from campus, our house, TKE, AGR and ZTA all have newer houses. Ours was built in 1999.