 There is glass over the tomb opening so the frescoes on the walls are visible from above, with Jan Borman being the creator of the tomb.The altarpiece of the large chapel in the southern aisle, known as the Cappella sacra created in the 18th century in the Baroque style, enshrines the most celebrated art treasure of the church—a white marble sculpture of the Madonna and Child created by Michelangelo around 1504.There is evidence of this date based on payments being made to Michelangelo by Florentine bankers Baldassare and Giovanni Balducci between 1503-1504.