Looking from the north (illustration, right), three streets branch out from the piazza into the city, forming the so-called "trident" (il Tridente): the Via del Corso in the centre; the Via del Babuino to the left (opened in 1525 as the Via Paolina) and the Via di Ripetta (opened by Leo X in 1518 as the Via Leonina) to the right. The twin churches (the chiese gemelle) of Santa Maria dei Miracoli (1681) and Santa Maria in Montesanto (1679), begun by Carlo Rainaldi and completed by Bernini and Carlo Fontana, define the junctions of the roads. Close scrutiny of the twin churches reveals that they are not mere copies of one another, as they would have been in a Neoclassical project, but vary in their details, offering variety within their symmetrical balance in Baroque fashion.