Here we again embarked, and after rowing some little way along the shore, landed and walked to the top of a hill, from which we had a view of the Elysian Fields, and of Lake Acheron below us. The lake is changed, like Avernus, but the Elysian Fields are still a beautiful wilderness. On our way we passed several ancient burying-places, and a variety of other ruins--ruins in the truest sense of the word, for the whole is an heap of rubbish. A little beyond this is the famous reservoir constructed for the use of the Roman Navy. The roof is supported by forty-eight square pillars, with a proportional number of arches, something in the style of the Nun's Cistern at Gibraltar, but on a scale so much more grand, that it would contain above an hundred times the quantity of water. From thence we proceeded through a vineyard to an amazing subterraneous building, supposed to have been Nero's prisons. The gallery is about twelve feet high, and nine wide. We were told that it proceeds in a right line from the entrance to the sea, and is divided into near an hundred apartments; but as it is full of stones, and as the air is said to be prodigiously hurtful, we could not prevail on our guide to descend to any distance in this direction, but, turning to the left, we entered a range of apartments in the form of a cross, which we supposed were for the officers, as the partition walls are only carried to within two feet of the arch. In the inmost fourteen bronze lamps were found. The niches they stood in still remain. On striking the ground, it returned a hollow sound, as if there was a range of prisons beneath. As soon as we returned to day-light, we descended to the sea-side, to the tomb of Agrippina. It is an arched vault, fifteen feet long, and nine wide, almost filled up with rubbish. The walls are covered with elegant basso-relievo miniature figures, in small squares, remarkably neat and beautiful; one represents a female deity, with extended wings, soaring in the air; two others are women reclining on a couch, but so choaked up with smoke and soot from the torches, that it is impossible to determine who they are: the workmanship, however, one easily perceives, exhibits the hand of a capital master, who has displayed so much taste, beauty and harmony, that we are almost tempted to forget Agrippina's crimes; and, in pitying her fate, we redouble our horror at the inhuman parricide who sent her to her tomb. It is not known by whom this monument was erected; and I think it not improbable, that it might have been ordered by Nero himself, since he is reported to have said, that, had he known how beautiful his mother was, he never would have destroyed her. Having now seen every thing on the coast of Baia, we returned to Puzzoli, and, to our inexpressible concern, found that it was too late to continue our excursion to Cuma.