The Beta house at Kansas was once owned by the Secretary of State (i think it was of state) under Abraham Lincoln.
The house here at Nebraska, has one unique characteristic, but I'm not at liberty to discuss it...sorry
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Oh and the Phi Delt house here also is on the national registry of architectural (sp?) land marks b/c it has a glass enclosed spiral staircase on the corner of their house (wow I didn't explain that very well at all...) that was designed by Frank Lloyd Wright (a well known Phi Delt, I've heard that he did a lot of designs for Phi Delt houses all across the country...)