When Cardinal Alessandro Farnese, Pope Paul III's grandson, retired to Caprarola, he intended to build a residence that would reflect the family's grandeur. In 1559, he entrusted the task to the leading architect Jacopo Barozzi da Vignola, who came up with some innovative ideas. A magnificent spiral staircase, lavishly decorated with allegorical figures, mythical landscapes, and grotesques by Antonio Tempesta, connected the main entrance with the cardinal's apartments on the main floor. The staircase was gently inclined, with very deep but low steps, so that the cardinal could ride his horse right up to his bedchamber. A tour includes the Hall of Farnese Triumphs, the Hercules Room, and the Antechamber of the Council of Trent, all painted by the Zuccari brothers. Of special interest is the Hall of the Maps, with the ceiling depicting the zodiac and the walls frescoed with maps of the world as known to 16th-century cartographers. The palace is surrounded by a formal Renaissance garden.