Michelangelo carved the Pietà between 1498 and 1499, when he was twenty-four, from a single block of Carrara marble. It stands in the Chapel of the Pietà, the first on the right as you enter St. Peter's. Mary's face reads younger than the body of Christ across her lap. It is the only work the sculptor ever signed: a strap across her chest, in Latin, his name. Since 1972 the marble has stood behind bulletproof glass. from the studio