 Sculptural works include a statue in the chapel of St. John by Domenico Gagini ; a "Virgin" and a "St. John the Baptist" by Andrea Sansovino.Other works include works by Matteo Civitali, Taddeo Carlone,and Giacomo and Guglielmo Della Porta .The Museum of the Treasury lies under the cathedral and holds a collection of jewellery and silverware from 9 AD up to the present.