The interior of the fortress can be visited by an order. Excavations made in 1825 have laid open the sepulchral chamber in the midst of the basement. Here, stood in the centre, the porphyry sarcophagus of Hadrian, which was stolen by Pope Innocent II. to be used as his own tomb in the Lateran, where it was destroyed by the fire of 1360, the cover alone escaping, which was used for the tomb of Otho II., in the atrium of St. Peter’s, and which, after filling this office for seven centuries, is now the baptismal font of that basilica. A spiral passage, thirty feet high and eleven wide, up which a chariot could be driven, gradually ascends through the solid mass of masonry. There is wonderfully little to be seen. A saloon of the time of Paul III. is adorned with frescoes of the life of Alexander the Great, by Pierino del Vaga. This room would be used by the pope in case of his having to take refuge in S. Angelo. An adjoining room, adorned with a stucco frieze of Tritons and Nereids, is that in which Cardinal Caraffa was strangled (1561) under Pius IV., for alleged abuses of authority under his uncle, Paul IV.--his brother, the Marquis Caraffa, being beheaded in the castle the same night. The reputed prison of Beatrice Cenci is shown, but it is very uncertain that she was ever confined here,--also the prison of Cagliostro, and that of Benvenuto Cellini, who escaped, and broke his leg in trying to let himself down by a rope from the ramparts. The statue of the angel by Montelupo is to be seen stowed away in a dark corner. Several horrible trabocchette (oubliettes) are shown. On the roof, from which there is a beautiful view, are many modern prisons, where prisoners suffer terribly from the summer sun beating upon their flat roofs. Among the sculptures found here were the Barberini Faun, now at Munich, the Dancing Faun, at Florence, and the Bust of Hadrian at the Vatican. The sepulchral inscriptions of the Antonines existed till 1572, when they were cut up by Gregory XIII. (Buoncompagni), and the marble used to decorate a chapel in St. Peter’s! The magnificent easter display of fireworks (from an idea of Michael Angelo, carried out by Bernini), called the girandola, used to be exhibited here, but now takes place at S. Pietro in Montorio, or from the Pincio. From 1849 to 1870, the Castle was occupied by French troops, and their banner floated here, except on great festivals, when it was exchanged for that of the pope. Running behind and crossing the back streets of the Borgo, is the covered passage intended for the escape of the popes to the Castle. It was used by Alexander VI. when invaded by Charles VIII. in 1494, and twice by Clement VII. (Giulio de’ Medici), who fled, in 1527, from Moncada, viceroy of Naples, and in May, 1527, during the terrible sack of Rome by the troops of the Constable de Bourbon.