Wren was awestruck when he saw Michelangelo's dome at St Peter's Basilica and Mansart's Church of the Val-de-Grâce. Unlike those of St Peter's and Val-de-Grâce, the dome of St Paul's rises in two clearly defined stories of masonry, totaling around 95 feet when combined with a lower unadorned footing. The 3-dome structure allows the inner dome to rise proportionately to the architecture while appearing massive and magnificent from the outside. The peristyle bolsters the inner dome and the brick cone that rises inside to support the lantern.