Religious architecture 's parish church • The parish church, dedicated to St.
Thomas of Villanova was designed by
Bernini (1658–1661) on the order of the
Chigi Pope Alexander VII, it has a square Greek key cross plan and houses a notable painting by
Pietro da Cortona portraying Christ's crucifixion. • Church of Our Lady of the Lake, wanted personally by
Pope Paul VI, was consecrated by the same pope in 1977, on the shores of Lake Albano. • Church of Santa Maria Assunta, construction began in 1619 with the consecration of the first stone by
Pope Paul V. • Church of Santa Maria, modern construction, situated in the populous district of Borgo San Paolo near State Road 7 Via Appia, the Ugo Bazzi theater adjoins the church. • Church of San Sebastiano, dedicated to the patron saint of the city and located on State Road 7 Via Appia adjacent to the church cemetery. • Church of Santa Maria Della Cona.
Civil architecture • The
Apostolic Palace of Castel Gandolfo, the
Pope's summer residence, is a 17th-century building designed by
Carlo Maderno for
Pope Urban VIII. The papal palace and the adjoining Villa Barberini, which was added to the complex by
Pius XI, have enjoyed
extraterritorial rights since the signing of the
1929 treaty with Italy; the little piazza directly in front was renamed
Piazza della Libertà in the first flush of
Italian unity after 1870. The
Papal Palace remained unused from 1870 until 1929. • Villa Cybo, built by Cardinal Camillo Cybo, was annexed to the whole of the Pontifical Villas at the time of
Pope Clement XIV who purchased it in 1774 from the owner at the time,
Francesco III d'Este, Duke of Modena, for the sum of 80,000 crowns. • Villa Barberini, built by the nephew of
Pope Urban VIII (Maffeo Barberini), was incorporated in the
extraterritorial complex of the Pontifical Villas in 1929: the manor houses the headquarters of the College of Propaganda Fide. As part of its extensive formal gardens is located the existing remains of the complex built by the Roman Emperor Domitian. • Villa Santa Caterina, currently owned by the Catholic Institute of Technology. During the construction of this villa, situated in the
Herculaneum area, the Roman ruins of the villa commonly 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. with the dome of the Collegiate Church of St. Thomas and that of the
Vatican Observatory 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. • Supposed 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 Catholic Institute of Technology. After recent studies and excavations, the site is now believed to have been an ancient shrine to the goddess Bona Dea. • 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
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