side, in the Piazza della Rotonda. They are not aligned with the grid of the castra and a bulla from the time of Hadrian, which suggests that these buildings predated the castra and were razed to the ground during its construction. "An intricate pattern of walls" was found under the Piazza della Rotonda, where the excavators of 1915-1916 found the remains of the rooms mixed with blocks of peperino fallen from the nearby wall of the northwest side. Other rooms were identified in the Piazza San Paolo from the same period. In general, the lodgings were built in opus latericium, interspersed with blocks of peperino from the end of the second century. In the 1980s, further remains of lodgings were identified, as well as a building with a portico on Castro Pretorio Street. "The Cisternoni" The very large cistern of the castra is found under the property of the episcopal seminary, with access from the piazza San Paolo and San Francesco d'Assisi Street. It is known to the Albanese as the Cisternoni (giant cisterns). The long sides measure 45.50 and 47.90 metres, while the short sides are 29.62 and 31.90 metres long, for a surface area of 1436.50 square metres and a capacity of 10,132 cubic metres of water. The structure, with five aisles, was carved into the bedrock as far as possible to a depth of between three and four metres; the height of the vaults is around 6.5 metres, with significant variation. On account of some ornamental elements discovered in 1830 and 1884 it is believed that at least the front of the monumental structure was ornate. Until the 1920s only a single supply tunnel of the cistern was known, which is located on the northeastern side. But the archaeologist Giuseppe Lugli discovered a second, more ancient tunnel on the same side, which served the cistern through a complex system until it broke. The water came to the Cisternoni from the Malafitto and Palazzolo springs, near Lake Albano. The cistern was still used by the Comune of Albano in 1884, but for hygiene reasons it was restricted to use for irrigation in 1912. Other cisterns, drains, and sewers One particular cistern of an elongated shape (around 30 metres long and 4.16 metres wide) with a barrel vault was discovered under Aurelio Saffi Street. It was probably part of a larger, no longer identifiable cistern. A decent stretch of