Introduction to the interior of the temple: The main temple of the church was built by Pasquale Belli between 1831 and 1854, and Luigi Poletti, who served as engineering director from 1833 to 1869, also made important contributions to it. The entire hall is 131 meters long, 65 meters wide and 30 meters high. It is divided into five spaces by four rows of stone pillars. The 80 pillars and exquisite ceiling are breathtaking.