Villa Torlonia is a public park that was one banking family's private garden, laid out with temples, an obelisk and a purpose-built ruin. You walk in past all of it. The house on the terrace is the part people come for. Mussolini rented the whole estate in 1925 and lived here for eighteen years, until July 1943, while the prince who owned it moved into a smaller building in the trees. From 1942 the fire service dug him a shelter under the side terrace, in concrete more than a metre thick, with airtight doors and a plant to filter the air.
The small building the prince moved into is the reason most Romans come. It began in 1840 as a mock Swiss cabin and was rebuilt from 1908 into a house covered in owls: stained glass, majolica, wrought iron and carved wood, with owls, ivy, swallows and roses worked into every window. Its rooms are small and domestic, decorated for private life rather than for official business. Around both buildings the park is now an ordinary public one, with joggers, dogs and a lemon house serving coffee. Under the lawns lie Jewish burial galleries from the third and fourth centuries, closed to visitors.