PLAN OF TIVOLI.

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The calciferous lake of Tartarus formerly existed, just beyond, but is now dried up. Near by a sulphurous odour indicates the proximity of the Aquæ Albulæ, baths often frequented in ancient times. A channel, constructed by Cardinal Este, draws off the water from these sulphurous lakes to the Tiber. The bath-house was erected in 1880, and the water is beneficial for skin diseases.

In the vicinity are the quarries of travertine—so called from the stone taking the ancient name Tiburtians—which have yielded the materials for building both ancient and modern Rome, the Colosseum, and S. Peter's.

Three miles from Tivoli we cross the picturesque

PONTE LUCANO,

which spans the Anio. Near by is the solid and magnificent Tomb of the Plautii, similar to that of Cecilia Metella. The upper part has been repaired in medieval times, that it might serve as a fortress. Erected, 1 B.C., by M. Plautius Silvanus for himself, Lartia his wife, and Urgularicus his child. The inscription tells us that one of his descendants served in Britain, and died A.D. 76.