Built in the years 1674-1728, there's seemingly not much to this church just off the market square. Hidden behind the bland exterior, however, is an absolute explosion of Baroque over-indulgence, with colourful carved wood, stucco, and paintings by local monk Adam Swach. His brother, Antoni, designed the high altar and ornamented stalls, which literally jump out at you in their bright flamboyance. It's a spectacle worth seeing, but visitors also flock to this church to see the Marian shrine, which has housed a famous picture of the Miracle-Working Virgin Mary, also known as the Lady of Poznań, for 300 years.