 He sold his father's remaining properties on Capri (the Villa Materita, inter alia), and bought the Castello di Lunghezza, a 108-room castle outside Rome.He opened Hildasholm, the property Axel Munthe had built for his wife Hilda in central Sweden, to the public, and did the same for Hellens and Southside House in England under the auspices of the Pennington-Mellor-Munthe Charity Trust, now (2007) chaired by his eldest son Adam John Munthe.Munthe dedicated his later years to running those properties, and writing, including a history of Hellens, "Hellen's, Much Marcle, Herefordshire" and "Special Forces Club".