Piber Federal Stud is where Austria's Lipizzaner horses are bred before the best stallions go on to the Spanish Riding School in Vienna. For travellers based in Graz, it makes a satisfying Styrian day trip: part working stud farm, part cultural institution, with tours that explain the horses, bloodlines, training path, and rural setting.
The visit is most rewarding if you have even a passing interest in horses or imperial Austrian tradition. Check the schedule before going, because the experience depends on guided tours and seasonal access rather than simply wandering in whenever you like.