This little town is the pope's summer retreat. It was the Barberini Pope Urban VIII who first headed here, eager to escape the malarial miasmas that afflicted summertime Rome; before long, the city's princely families also set up country estates around here.
The 17th-century Villa Pontificia has a superb position overlooking Lake Albano and is set in one of the most gorgeous gardens in Italy. Fortunately, these treasures are now open to the public as papal audiences are no longer held at Castel Gandolfo. On the little square in front of the palace there's a fountain by Bernini, who also designed the nearby Church of San Tommaso da Villanova, which has works by Pietro da Cortona.
The village has a number of interesting craft workshops and food purveyors, in addition to the souvenir shops on the square. On the horizon, the silver astronomical dome belonging to the Specola Vaticana observatory—one of the first in Europe—where the scientific Pope Gregory XIII indulged his interest in stargazing, is visible for miles around.