The High Baroque spread gradually across Italy, beyond Rome. The period saw the construction of Santa Maria della Salute by Baldassare Longhena in Venice (1630–31). Churches were not the only buildings to use the Baroque style. One of the finest monuments of the early Baroque is the Barberini Palace (1626–1629), the residence of the family of Urban VIII, begun by Carlo Maderno, and completed and decorated by Bernini and Francesco Borromini. The outside of the Pope's family residence, was relatively restrained, but the interiors, and especially the immense fresco on the ceiling of the salon, the "Allegory of Divine Providence and Barberini Power" painted by Pietro da Cortona, are considered masterpieces of Baroque art and decoration. Curving facades and the illusion of movement were a speciality of Francesco Borromini, most notably in San Carlo alle Quattro Fontane (1634–1646), one of the landmarks of the high Baroque. Another important monument of the period was the Church of Santi Luca e Martina in Rome by Pietro da Cortona (1635–50), in the form of a Greek cross with an elegant dome. After the death or Urban VIII and the brief reign of his successor, the Papacy of Pope Alexander VII from 1666 until 1667 saw more construction of Baroque churches, squares and fountains in Rome by Carlo Rainaldi, Bernini and Carlo Fontana.