I remember reading that the last person in Europe to be publicly burned as a witch was a Poznanian. I wonder if she was met her end on this spot...?
'Poznan Army Monument' is worth seeing. One can spend a couple of hours going through the antiqued arsenal. There are some planes and tankers(probably used in WW-II) outside the museum. Kid's and young people would like it.
From a distance it did look kind of 'jagged' but, like the review said, at a closer look you get a feel of how widespread the effect of the war was in Poland. Later on when I was returning from the Citadel the monument was occupied by skaters. That's a lot of flat surfaces for them!