The Saint Sebastian Parish has been proud of its new church, dedicated in May 1960. The architecture is modern Romanesque; the exterior construction is cream-colored brick, and the interior construction is Travertine marble and nine other marbles imported from Italy.

St. Sebastian Church has a large-mosaic depicting the scene of the Last Supper behind the main altar. The altar is made of Giallo Doro marble. The sketch for the mosaic scene was chosen from several submitted by the DePrato Co. in Chicago. This sketch was then sent to Venice where it took one year to make the 175,000 pieces of Venetian glass that make up the complete scene. It took six weeks for four Italian workmen to piece together and cement the mosaic to the wall. The Stations of the Cross were made in the same manner as the scene of the Last Supper and are embedded in Travertine marble.

The stained glass windows were made of baked glass by Francesco Marcione over a period of a year. There are 14 hand carved wooden statues in St. Sebastian Church, carved by artisans in the Tyrolean sector of Italy. The eight side altars have stained glass windows on each side to depict the lives of the saints represented.