The Vatican city, an independent state located inside the city of Rome on the west bank of the Tiber River, consists of St. Peter's Basilica, the circular St. Peter's square, the Vatican Palace with the Sistine Chapel, as well as other buildings and gardens. The Basilica of St. Peter was built on the tomb of St Peter the Apostle, and the first large basilica was built by Constantine the Great in the 4th century. Rebuilding started in 1506, being designed by Bramante, Raphael, Michelangelo, Maderna and Bernini. The basilica was consecrated in 1626.