Corpus Christi Basilica is a Gothic church founded by Kazimierz the Great in 1335. The interior of the church is a mixture of Polish Gothic and impressive Polish Baroque architecture, with structural features such as the marvellous Baroque high altar, a boat-shaped pulpit (1750), and organs. The church is often said to be one of the most beautiful Baroque sites in Central Europe.
The basilica was erected in stages beginning in 1340 until the mid 15th century, and was intended as a monastery, which explains the large size plot on which it stands and the presence of a cemetery next to it. The church was robbed clean and the interior utterly devastated by Swedes in 1655, which explains the prevalence of Baroque in its current decoration.