These are thus described by Rollin:--The castle of Cairo is one of the greatest curiosities in Egypt. It stands on the hill without the city, has a rock for its foundation, and is surrounded with walls of a vast height and solidity. You go up to the castle by a way hewn out of the rock, and which is of so easy ascent, that loaded horses and camels get up without difficulty. The greatest rarity in this castle is Joseph's Well; so called, either because the Egyptians are pleased with ascribing their most remarkable particulars to that great man, or because there is really such a tradition in the country. This is a proof, at least, that the work in question is very ancient; and it is certainly worthy the magnificence of the most powerful kings of Egypt. This well has, as it were, two stories, cut out of a rock to a prodigious depth. One descends to the reservoir of water between the two wells by a staircase seven or eight feet broad, consisting of two hundred and twenty steps, and so contrived, that the oxen employed to throw up the water, go down with all imaginable ease; the descent being scarcely perceptible. The well is supplied by a spring, which is almost the only one in the whole country. The oxen are continually turning a wheel with a rope, to which buckets are fastened. The water thus drawn from the first and lowermost well is conveyed by a little canal into a reservoir which forms the second well, from whence it is drawn to the top in the same manner, and then conveyed by pipes to all parts of the castle. The remains of Egyptian Babylon merit attention, says Mr. Wilkinson; and, among other objects shown by the monks, who live there, is a chamber of the Virgin, the traditions concerning which have been treated by the credulous with the same pious feelings as the tree at Heliopolis. The station of Babylon is evidently of Roman construction, and probably the same that is mentioned by Strabo, in which one of the three Roman legions was quartered. It formed part of the town of Fostat, built by Amer, near the ruins of Babylon, and the mosque, called after him, marks the spot of his encampment, which subsequently became the centre of the city he had founded. The exterior of the Roman station still reminds us of its former strength, which defied the attacks of the Arab invaders for seven months, and its solid walls still contain a village of Christian inhabitants. Over the triangular pediment of the doorway, which is on the south side, appears to have been an inscription, long since removed; and in an upper chamber above one of the bastions of this now-closed entrance, is an old Christian record, sculptured on wood, of the time of Dioclesian, which is curious from its material and the state of its preservation.