The church's main altar, as well as its matching two side altars reputedly originate from the 1893 Columbian Exposition. In 1903 the interior was painted for the first time, and it was at this time that all the plaster and wood ornament were added and the church received the character it has today. The stained glass windows were made by Gawin Co. of Milwaukee, while the interior murals were painted by Lesiewicz around 1920. In addition to religious scenes, such as the Resurrection under the main altar, the artist decorated the side walls with paintings of Polish patron saints.