What is Castel Gandolfo known for?

Summer residence of the popes since 1626, designed by Carlo Maderno for Urban VIII Barberini; restored to residential use under Leo XIV in 2025. Volcanic crater lake 170 meters deep, fused from two craters at the foot of the town, ringed by the Castelli Romani. Moved to the Pontifical estate in 1934 when Rome's light pollution ended astronomy from the Vatican; 1935 telescope domes still in use.

Where is Castel Gandolfo?

Castel Gandolfo is a comune in the province of Roma, Lazio region of Italy, about 24 kilometers from Roma.

Lazio · Roma

Castel Gandolfo

A papal town on the rim of Lake Albano's volcanic crater, summer residence of the popes since 1626 in the Castelli Romani.

24 km / 15 mi

Nearest hub (Roma)

8,564

Population

Apr–Oct

Best time to visit

Recognised as

Why come

Castel Gandolfo sitson the rim of the Lake Albano crater, twenty-five kilometers southeast of Rome in the Castelli Romani. The lake below, 293 meters above sea level, was formed by the fusion of two volcanic craters and reaches 170 meters deep. The town stands on the site of Alba Longa, the city Aeneas's son Ascanius is said to have founded. The Apostolic Palace was built by Carlo Maderno for Pope Urban VIII Barberini and has been a papal summer residence since 1626. Adjacent to it stands the Villa Barberini, acquired by Taddeo Barberini in 1631, with gardens running down to the lake. The Vatican Observatory moved here in 1934 when light pollution made astronomy impossible from Rome; its 1935 telescope domes are on the palace roofs. Pope Francis kept the palace open as a museum after 2016. Leo XIV restored it to residential use in June 2025 and resides in the adjacent Villa Barberini. The Borgo Laudato Si, created by Francis in 2023, runs ecological education across 55 hectares of the estate.

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Gallery

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Known for

Palazzo Apostolico
Built 1623-1626 by Carlo Maderno for Urban VIII, papal summer residence since 1626, museum since 2016, restored to papal use in June 2025.
Ville Pontificie e Giardini Barberini
Fifty-five hectares of papal villas and gardens running down to Lake Albano, with the seventeenth-century Villa Barberini at their center.
Lago Albano
Volcanic crater lake at 293 meters, fused from two craters, 170 meters deep, 5 square kilometers, ringed by Castel Gandolfo and Albano Laziale.
Specola Vaticana
Vatican Observatory relocated to the palace in 1934 when Rome's lights ended astronomy from the Vatican; 1935 telescope domes on the roofs.
Borgo Laudato Si'
Ecological garden, farm and education area created by Pope Francis in 2023 across 55 hectares of the Pontifical estate.
Piazza della Libertà
Central piazza in front of the Apostolic Palace, with the seventeenth-century parish church of San Tommaso da Villanova by Bernini.

When to visit

Best months · Apr–Oct

Best
Hot or crowded
Quiet
Mostly closed

April through October is the open season for Castel Gandolfo, with the gardens open and the lake at swimming temperature from June. June and September are the calmer months and the historic papal-residence weeks. July and August fill with Roman day-trippers and Vatican tourists; the lake shore is busy. November through March is quiet, the lake cool and clear, the palace open as museum at reduced hours. The papal feast of Saints Peter and Paul on 29 June is the year's anchor event when the pope is in residence.