The Villa of Grottacce is located along the Aurelia road (58,200 km) at the municipality of Santa Marinella, in the nineteenth century and was excavated in 1952 by the SAEM, takes its name from the ruins of the tanks that were used to collect water and that in the early twentieth century were in fact called "Grottacce" by locals.. The visible part of the seaside villa covers an area of 50x100m, while its original extension was about an acre and a half. The building is located on a cliff 10 meters high above sea level and connected to the house was a semi-circular pond with a little pier to moor navi.La villa was built in two stages, first considering the opus reticulatum walls reinforced with blocks can be dated The beginning of the century A.D., The fragments found from the excavation show that the house was inhabited until most of the sixth century A.D. only to be abandoned, perhaps because of a pillaging pirate because of his proximity to the coast. In fact, the mortar and the stones used are the same as the first phase of construction of the house. The house was on two levels, but only the basement survived the erosion of time. The tables around the outside and inside a total of fourteen tanks with a barrel vault, this means that so many were not used only for life in the mansion, but also as parts of water to use for fishing. Some of these tanks were, with the second reconstruction of the villa, transformation in warehouses for the storage of food alimentari.Beside the long vaulted corridor, which crosses the tanks, the apparent criptoportico barrel-vaulted corridor that serves both to link with A second part of the house and as a support for the second floor of the north side of the house , emerging signs of a possible thermal construction, while the marble floor of the second floor known from the bibliography of the excavations are gone, possibly covered by earth. The water supply was possible by means of three wells connected to the tanks below. The fishpond was built on a base of sedimentary rock (pietraforte) very hard (at Civitavecchia since the Etruscans, there are several quarries where the stone called "scale" was removed to make the blocks) and probably the base was excavated in part to strengthen the foundations of the walls used as breakwaters.  Today the building is submerged, but when it was built, from its outer edge, the sea had to be within a 10 m at low tide. The plan is semicircular, formed by four concentric semicircles and the largest 55m in diameter. The semicircle of greater than 1m thick, and had served as a breakwater breaks the circle of sea water. Al suo interno, dalla parte ovest,.Inside, on the west side, surely you can see two tanks used for fish, a form of rettangular (8.6x9.8m) and keystone (8.6x5.5x7.4m). At a distance of between 1.5-2.5m begins a second period of a thickness of about 4.3m. this served as a retaining wall and it also has some breaks for the passage of sea water. The third arc is a single tank internally divided into five cells, and the last arc instead consists of a single semi-circular pool 20m in diameter On the east side of the fishpond outcrop traces of the walls parallel and perpendicular to the coast to be the remains of the small pier adjacent to the Roman villa. Some speculate that it was the ancient port of Panapione appointed Itinerary matittimus Antonini (III sec. A.D.) and in fact, about 20m from the shore on the sea floor are the remains of two Roman ships of merchant type first identified by P.Gianfrotta.



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