this villa, situated in the Herculaneum area, the Roman ruins of the villa attributed to Publius Clodius Pulcher were discovered. Villa Torlonia, built in the 16th century by the Roman family of the Giustiniani, then passed into ownership of the Duke of Bracciano Giuseppe Torlonia. The current appearance is due to the restoration of 1829, funded by Duke Carlo Torlonia. Villa Chigi built by Cardinal Flavio Chigi, nephew of Pope Alexander VII; today it is home to a golf course. The two telescopes of the Vatican Observatory, which were moved from Rome to Castel Gandolfo in the 1930s, were still used until the 1980s. The headquarters of the Vatican Observatory is still located in Castel Gandolfo. However, its dependent research center, the Vatican Observatory Research Group (VORG), is hosted by Steward Observatory at the University of Arizona, Tucson, United States. The telescopes are located in Mt. Graham, Arizona. Archaeological sites The site of the papal palace: rebuilt on the ruins of the former castle, partly occupies the foundations of a summer residence of the Emperor Domitian that occupied . The residence was designed by the architect Rabirius. In the palace's inner courtyard is a Roman bust depicting Polyphemus, the Cyclops from whose cave Ulysses escaped; it was found in the nymphaeum of the Imperial villa's gardens, an artificially constructed grotto of the crater lake's outlet. Villa of Publius Clodius Pulcher: the remains of a Roman villa located on the Appian Way, of National Road 7 Via Appia, inside the Villa Santa Caterina, owned by the Pontifical North American College. The Bergantino or bath of Diana nymphaeum: on the western shores of the Lake Albano, after the Doric nymphaeum, this structure, originally annexed to the Domitian Villa at Castel Gandolfo, opens in a circular cave of in diameter. There is a bath in the middle of the cave, and the floor was completely covered with mosaics, of which a few fragments remain. Various parts of sculptural groups now kept at the Pontifical Palace in Castel Gandolfo have been found in the nymphaeum. Emissary of the Lake Albano: an artificial conduit of runoff water, long, that runs from the West coast of Lake Albano and leads into Castel Gandolfo territory. According to tradition, it was built in 396 BC to fulfil a prophecy during the conquest of Veii. Education Castel Gandolfo does not host secondary schools. Within the municipal area lie a