Things that exist: Battle Abbey
Aside from the awesome name, the abbey invokes some interesting fantasy and roleplaying images. It would be used as a model for an abbey that trains clerics and paladins. Maybe the abbey was abandoned in the past and an order of paladins takes possession of it as both a headquarters and a training ground for paladins. You could even include the abbey's partial destruction as the result of a titanic battle between the paladins and an evil army and turn it into a location for your players to explore.
Oh, the possibilities!