Union troops spared only seven of the buildings on the UA campus. Of the principal buildings remaining today, the President's Mansion and its outbuildings still serve as the president's on-campus residence. The other buildings have new uses. Gorgas House, at different times the dining hall, faculty residence, and campus hotel, now serves as a museum. The Roundhouse, then a sentry box for cadets, later a place for records storage, is a campus historical landmark. The Observatory, now Maxwell Hall, is home to the Computer-Based Honors Program.