Yes.
I've been to Krakow quite a few times - it's a great, very walkable, city; I always stay in Kazimierz, which was the old Jewish ghetto where the pogroms were, and there's a bar around the corner from the hotel I stay in where, in the courtyard, the wall is still peppered with bullet holes.
I went to Auschwitz during my first stay in Krakow, and it was the most humbling experience of my life - even just typing this is making the hairs on the back of my neck stand on end; it's that powerful.