The investment in public works included the loggia of Sixtus in the Basilica of St. John Lateran; the chapel of the Praesepe in Santa Maria Maggiore; additions and repairs to the Quirinal Palace, Lateran Palace and Vatican Palace; the erection of four obelisks (including the one in the Piazza of St Peter's; the opening of six streets; and the restoration of the aqueduct of Severus ("Acqua Felice").