These tombs were ruthlessly destroyed by the municipality in 1884. _From the square the road leads to some remains of_ THE BATHS OF GALLIENUS, miscalled the Temple of Minerva Medica, from a statue of the goddess discovered here. It is a circular building, 80 feet in diameter, and its walls contain numerous niches for statues; it was surmounted by a lofty cupola, which fell in a short time ago. This building was no doubt the sudatorium of the baths of Gallienus, which stood in his gardens and occupied this ground. In the fragments of chambers adjoining, terra-cotta pipes for the supply of hot water may still be seen. _The road from here leads to_ THE CHURCH OF S. BIBIANA, built in commemoration of her martyrdom. At the early age of eighteen, during the prefecture of Apronianus, she was first scourged, and then stoned to death. The church contains eight antique columns, and frescoes from the saint's life by Cortona and Ciampelli. Her statue at the high altar is the work of Bernini, and is considered to be his masterpiece. The _fête_ of S. Bibiana is the S. Swithin's day of the Romans, who have a saying that "if it rain on this day it will continue to do so for the next forty." We are not superstitious, but we cannot help wishing that the saint will smile upon us. The Church of S. Bibiana was built in the fifth century, on the site of the house where the virgin-martyr is believed to have lived. It was in a great measure rebuilt by Pope Urban VII., and is only open on the Friday after the fourth Sunday in Lent, and on the 2nd of December, the anniversary of the saint. _Passing by the church, the road leads us through the new quarter of the town. Passing the remains of a tower in the Agger, we turn to the right, and pass the railway station through another section of the new quarter. Behind the custom-house is a fine piece of the Agger and the Porta Viminalis. Beyond, the barracks occupy the site of_ THE PRÆTORIAN CAMP, founded by Sejanus, the minister of Tiberius Cæsar, and destroyed by Constantine. The walls consist of brickwork, and have corridors on the inside, decorated with stucco and paintings. The camp was between the Portæ Viminalis and Nomentana, and forms a square projection in the present wall. It was outside the agger of Servius Tullius. The north wall is of the time of Tiberius; the east was rebuilt in the fourth century; the south has been reconstructed out of old square stones, probably material taken from the west or city wall (which has never been found), or from fragments of the Agger of Servius Tullius. To write the history of the Prætorian Camp would be equivalent to writing the history of Rome from Tiberius to Constantine. Here murderers were made emperors, and the empire put up to auction. Hence the Prætorians sallied out to attack the citizens, who in their turn assailed the camp. Here the guilty found asylum, and the innocent death. _Near the camp stood_ THE TEMPLE OF FORTUNA PRIMIGENIA.