Having said so much of St. Peter’s, unquestionably the finest piece of modern architecture in Rome, allow me to mention some of the best specimens of the ancient. I shall begin with the Pantheon, which, though not the largest of the Roman temples, is the most perfect which now remains. The Temple of Jupiter Capitolinus, and the Temple of Peace, if we may trust to the accounts we have of the first, and to the ruins of the second, in the Campo Vaccino, were both much larger than the Pantheon. In spite of the depredations which this last has sustained from Goths, Vandals, and Popes, it still remains a beauteous monument of Roman taste. The pavilion of the great altar, which stands under the cupola in St. Peter’s, and the four wreathed pillars of Corinthian brass which support it, were formed out of the spoils of the Pantheon, which, after all, and with the weight of eighteen hundred years upon its head, has still a probability of outliving its proud rapacious rival. From the round form of this temple, it has obtained the name of Rotunda. Its height is a hundred and fifty feet, and its diameter nearly the same. Within, it is divided into eight par............