I think U of M might be good--it has the whole Gothic castle appeal that I'm sure is siege-worthy, plus it meets the aforementioned cold climate requirement. You could hunker down in the Lawyer's Club and wait the flesh-craving bastards out.
Consequently, if the entire Michigan football team survived in the law school they might have a shot beating the broken and battered (and eaten) Buckeyes the following year... unless Lloyd Carr survived in there with them, then they're screwed.