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to the city by the rebuilding of the Old Town burnt down in Nero's fire, and by the "Golden House" of Nero, a gorgeous pile, the like of which was never seen before, but which was destroyed on the violent death of its creator. Of the luxurious grandeur of private buildings we have ocular proof in the dwelling-houses of Pompeii, a paltry country-town in comparison with Rome. The progress made under the Flavian emperors is evidenced by Vespasian's Amphitheatre (q.v.) known as the Colossēum (figs. 8, 9, 10), the mightiest Roman ruin in the world, by the ruined Thermæ, or Baths, of Titus, and by his Triumphal Arch (q.v.), the oldest specimen extant in Rome of this class of monument, itself a creation of the Roman mind (fig. 11). But all previous buildings were surpassed in size and splendour when Trajan's architect Apollodōrus of Damascus raised the Forum Trāiānum with its huge Basilica Ulpia (fig. 12) and the still surviving Column of Trajan. No less extensive were the works of Hadrian, who, besides adorning Athens with many magnificent buildings, bequeathed to Rome a Temple of Venus and Roma, the most colossal of all Roman temples (fig. 13), and his own Mausoleum (q.v.), the core of which is preserved in the Castle of St. Angelo. While the works of the Antonines already show a gradual decline in architectural feeling, the Triumphal Arch of Severus ushers in the period of decay that set in with the 3rd century. In this closing period of Roman rule the buildings grow more and more gigantic, witness the Baths of Caracalla (fig. 14), those of Diocletian, with his palace at Salona (three miles from Spalatro) in Dalmatia, and the Basilica of Constantine breathing the last feeble gasp of ancient life. But outside of Rome and Italy, in every part of the enormous empire to its utmost barbarian borders,