[Sidenote: Temple of Venus and Rome.]
[Sidenote: Mausoleum of Hadrian.]
[Sidenote: Hadrians Villa.]
None of the Roman emperors had so great a passion for building as Hadrian, who succeeded Trajan A.D. 117. He erected a vast number of edifices, and in his reign Rome attained its greatest height of architectural splendor. The most remarkable among the edifices which he built was the Temple of Venus and Rome, facing on one side the Colosseum, and the other the Forum, on the site of the Atrium, or the golden house of Nero. This seems to have been one of the largest of the Roman temples, erected on an artificial terrace five hundred feet long and three hundred broad. It was surrounded with a portico four hundred feet by two hundred, and another portico of four hundred columns inclosed the terrace on which the temple was built, the columns of which were forty feet in height. The roof was covered with bronze tiles. Ammianus Marcellinus classes this magnificent temple with the Capitoline Temple, the Flavian Amphitheatre, and the Pantheon. The next greatest work of Hadrian was the Mausoleum, which is now converted into the Castle of St. Angelo, built on a platform of which each side was two hundred and fifty-three feet in length. From the magnificent colonnade which supported the platform on which it was built, and the successive stories supported by arches and pillars, between which were celebrated statues, this circular edifice, one hundred and eighty-eight feet in diameter, must have been one of the most imposing edifices in the city. After eighteen centuries, it still remains a monument of architectural strength, and it served for one of the strongest fortresses in Italy during the Middle Ages. I pass by, without notice, the villa this emperor erected at Tivoli, the ruins of which are among the most interesting which remain of that great age.
[Sidenote: Column of Marcus Aurelius.]
[Sidenote: Arch of Septimius Severus.]
[Sidenote: Baths of Caracalla.]
Under Hadrian Rome attained its greatest splendor, and after him, there was a progressive decline in the arts, since the public taste was corrupted. Still successive emperors continued to adorn the city. Marcus Aurelius, the wisest and best of all the emperors, erected a column similar to that of Trajan, to represent his wars with the Germanic tribes, and this still remains; he also built a triumphal arch. Septimius Severus erected the most beautiful of the triumphal arches, of which the Arc de Triumph in Paris is an imitation; and Caracalla built one of the greatest of the Roman baths, which, with the porticoes which surrounded it, formed a square of eleven hundred feet on each side—so enormous were these structures of luxury and utility, designed not only for the people as a sanitary measure, but for places of gymnastic exercises, popular lectures, and the disputations of philosophers. The Pantheon was merely an entrance to the baths of Agrippa. The baths of Trajan covered an area nearly as great. But those of Caracalla surpassed them all in magnificence. Nothing was more striking to a traveler than the painted corridors, the arched ceilings, the variegated columns, the elaborate mosaic pavements, the immortal statues, and the exquisite paintings which ornamented these places of luxury and pleasure. From amid their ruins have been dug out the most priceless of the statues which ornament the museums of Italy—the Farnese Hercules, the colossal Florae, the Torso Farnese, the Torso Belvidere, the Atreus and Thyestes, the Laocoon, beside granite and basaltic vases beautifully polished, cameos, bronzes, medals, and other valuable relics of ancient art. To supply these baths new aqueducts were built, and the treasures of the empire expended. Those subsequently erected by Diocletian contained three thousand two hundred marble seats, and the main hall now forms one of the most splendid of the Roman churches.
[Sidenote: Temples and Palaces.]
[Sidenote: General aspect of the city.]