We know little of any of the civil buildings with which the cities of Etruria were adorned, beyond the knowledge obtained from the remains of their theatres and amphitheatres. The form of the latter was essentially Etruscan, and was adopted by the Romans, with whom it became their most characteristic and grandest architectural object. Of the amphitheatres of ancient Etruria only one now remains in so perfect a state as to enable us to judge of their forms. It is that at Sutrium, which, however, being entirely cut in the rock, neither affords information as to the mode of construction nor enables us to determine its age. The general dimensions are 295 ft. in its greatest length by 265 in breadth, and it is consequently much nearer a circular form than the Romans generally adopted: but in other respects the arrangements are such as appear to have usually prevailed in after times. Besides these, we have numerous works of utility, but these belong more strictly to engineering than to architectural science. The city walls of the Etruscans surpass those of any other ancient nation in extent and beauty of workmanship. Their drainage works and their bridges, as well as those of the kindred Pelasgians in Greece, still remain monuments of their industrial science and skill, which their successors never surpassed. On the whole, perhaps we are justified in asserting that the Etruscans were not an architectural people, and had no temples or palaces worthy of attention. It at least seems certain that nothing of the sort is now to be found, even in ruins, and were it not that the study of Etruscan art is a necessary introduction to that of Roman, it would hardly be worth while trying to gather together and illustrate the few fragments and notices of it that remain. TOMBS. The tombs of the Etruscans now found may be divided into two classes—first, those cut in the rock, and resembling dwelling-houses; secondly, the circular tumuli, which latter are by far the most numerous and important class. Each of these may be again subdivided into two kinds. The rock-cut tombs include, firstly, those with only a façade on the face of the rock and a sepulchral chamber within; secondly, those cut quite out of the rock and standing free all round. To this class probably once belonged an immense number of tombs built in the ordinary way; but all these have totally disappeared, and consequently the class, as now under consideration, consists entirely of excavated examples. The second class may be divided into those tumuli erected over chambers cut in the tufaceous rock which is found all over Etruria, and those which have chambers built above-ground.