Built between 1904 and 1907 by mathematician Vito Volterra and his wife Virginia Almagia, it is considered the most prestigious Ariccia residence after Palazzo Chigi and Primoli. It was designed by architect Giulio Magni and is a beautiful example of a summer residence of the Roman upper middle class families of the time. It consists of a three-story villa with a panoramic terrace, an outbuilding on the Appian Way, and an old greenhouse; all set in a splendid eclectic garden of obvious naturalistic and archaeological value. Perfectly preserved and recently restored, it was declared of building of cultural interest in 2016. It currently hosts a rich calendar of activities (exhibitions, displays, courses seminars, workshops) and private events.