The interior reconstruction design considerably differed from the pre-war Cathedral, taking it back in time to its raw Gothic look, because very little of the cathedral's original furnishings has been preserved. The Cathedral is a three-nave building, two aisles are the same height as the main nave. On the right side from the front a belfry is situated, a passage to Dziekania Street is situated underneath it. There is a pulpit from 1959, designed by Józef Trenarowski and stalls which are a replica of the destroyed baroque ones, founded by King John III Sobieski. Moreover, there are many chapels, gravestones and epitaphs in the Cathedral. By the left aisle are numerous chapels. They are, in turn, from the main altar: