This ruin agrees exactly with the lower part of the Tomb of Porsena at
Clusium, described by Pliny (xxxvi. 19). He says: "But as the
fabulousness of the story connected with it quite exceeds all bounds,
I shall employ the words given by M. Varro himself in his account of
it. 'Porsena was buried,' says he, 'beneath the city of Clusium, in
the spot where he had constructed a square monument, built of squared
stones. Each side of this monument was 300 feet long and 50 feet high,
and beneath the base, which was also square, was an inextricable
labyrinth.... Above this square building there stood five
pyramids--one at each corner and one in the middle--75 feet broad at
the base and 150 feet in height,'" &c.
The present ruin is 49 feet long on each side and 24 feet high,
surmounted at the angles with four cones, and one larger, in the
centre, 26 feet in diameter, in which the urn was found in the last
century.