And another church! But I would say the Church of the Virgin Mary (Kosciol Mariacki in Polish, good luck for the pronunciation!) is worth to enter and look around whether you are a believer or not. The impression you get once inside is you are a bit overwhelmed by the quantity of gold, sculptures and so on. Just like most of the “protected” places in Poland you have to pay if you want to take some pictures and as a Frenchman I obviously didn’t pay and took nevertheless some discreet pictures ;)
You can also go on the top of the tower for an extra fee and get a nice view on Krakow.