It is, of course, possible that the tomb of Porsena was erected on the hill above this labyrinth, but we have not much evidence on the point. If the tomb possessed a labyrinth, no doubt the latter would have been something of this type. Dennis also mentions various other labyrinths of this nature in Etruria--for example, one near Volterra, "a long passage cut in the rock, six feet wide but only three high, so that you must travel on all-fours. From time to time the passage widens into chambers, yet not high enough to permit you to stand upright, or it meets the passages of similar character opening in various directions and extending into the heart of the hill, how far no one can say. In short, this is a perfect labyrinth in which, without a clue, one might very soon be lost." He also mentions one at San Pietro, Toscanella, "in the cliffs below the Madonna dell' Olivo, about half a mile from the town. Here a long, sewer-like passage leads into a spacious chamber of irregular form, with two massive columns supporting its ceiling and a rude pilaster on the wall behind. But the peculiarity of the tomb lies in a _cuniculus_ or passage cut in the rock, just large enough for a man to creep through on all-fours, which, entering the wall on one side after a long gyration and sundry branchings, now blocked with earth, opens in the opposite wall of the tomb." [Illustration: Fig. 14. Poggio Cajella. Labyrinthine Cemetery. (Dennis)] These Etruscan labyrinths were all of a sepulchral character, and one is naturally reminded of the catacombs of Rome, Paris, and Naples, to which, however, the term "labyrinth" is not customarily applied. Strabo uses the word in reference to a catacomb near Nauplia, which he calls the Labyrinth of the Cyclops. In Pliny's time the word would appear to have been used to denote a winding path following a more or less formal design of intricate pattern, but not necessarily connected with sepulchral purposes. When speaking of the Labyrinth of Crete he says, "We must not compare this to what we see traced upon our _mosaic pavements_ or to the _mazes formed in the fields_ for the entertainment of children, and thus suppose it to be a narrow path along which we may walk for many miles together, but we must picture to ourselves an edifice with many doors and galleries which mislead the visitor...." This passage shows that the term "labyrinth" had come to have a fairly broad significance. It had long been used in a metaphorical sense, even as we find Plato, over four centuries earlier, employing it to describe an elaborate argument. We also find it applied by extension to other objects, such as traps for fish, to judge by a certain passage in the works of Theocritus. The only buildings to which the ancient writers applied the term, however, were those to which we have already referred.