It must be distinctly understood that not every wall built of stones, without any binding material, may be called "Cyclopean;" and that under that denomination are only comprised, firstly, the walls of large unwrought blocks, the interstices of which are filled in with smaller stones; secondly, the walls composed of large polygonal stones well fitted together; and, thirdly, the very ancient walls (such as we see in the Lions' Gate at Mycenæ) where immense quadrangular blocks, rudely wrought, are roughly put together in horizontal layers, but the joints not being quite straight, there remain small interstices between the stones. House or fortress walls of well-cut quadrangular slabs, which are closely joined without mortar, can never be called "Cyclopean;" and thus, even the large subterranean Treasuries at Mycenæ and Orchomenus can in no way claim this denomination, though they may belong to the remotest antiquity.[32] The quarry from which these walls were built can easily be distinguished at the foot of a rock one mile distant, which is crowned by a chapel of the prophet Elias. But this quarry does not form a pit, such as we see at Syracuse, Baalbec, or Corinth. At Tiryns, as at Mycenæ, the Cyclopean builders have contented themselves with cutting away the blocks from the rocky surface. [Sidenote: THE CITADEL OF TIRYNS.] The flat rock of Tiryns, which is 900 feet long, from 200 to 250 feet broad, and from 30 to 50 feet high, extends in a straight line from north to south, and its margin is lined by the aforesaid Cyclopean circuit wall, which is from 25 to 50 feet thick, and in a pretty good state of preservation; but it is not always massive, being traversed by interior passages or galleries with ogival vaults, of which four can easily be discerned. One of these galleries, which is 90 feet long and 7 feet 10 inches broad and high and free from _débris_, has in its external wall six gate-like recesses or window openings, which reach down to the bottom. Their pointed arches are formed like the angle in the passage, merely by overlapping the ends of the courses of the masonry.[33] These niches were most probably intended for archers, whilst the galleries themselves must have served for covered communications leading to armouries, guard-chambers, or towers. Of the other three galleries, two are in the south-eastern corner and run parallel to each other; the third, which traverses the western wall, seems to have served as a sally-port, and was probably concealed in some way or other.[34]