Each and every monument has an interesting tale to tell. Visit Plague Pillar and learn a bit about the area's history.
You'll have no end of sightseeing choices when in Maribor. Plague Pillar is a great place to begin here, but there are plenty of other worthwhile sights to experience. Mariborsko Pohorje, University of Maribor, and Piramida are near the commemorative structure and and will cap off your day nicely.