The building itself is truly impressive. The largest church in the world, it has a 218 meter long nave. The basilica's dome, designed by Michelangelo is the largest dome in the world measuring 42m in diameter and reaching 138 meter high (more than 450ft). The interior, which includes 45 altars, is decorated by many famous artists. Some of the most important works in the church are the Pietà by Michelangelo, the papal altar by Bernini, the Throne of St. Peter - also by Bernini - and the Monument to the Stuarts by Canova.