One of the most evocative of Kraków's many churches, chiefly because of the statues of the 12 disciples lining the front entrance. It's said that the Jesuits spent so much money building the front and the facade that they ran out of money to finish the rest of the building (which, if you look behind the facade, you'll see is constructed from ordinary brick). The interior is less impressive, though still worth a peek in. One of the highlights is a model of Foucault's Pendulum, which demonstrates the rotation of the Earth. It's also a great spot for church concerts.