Pratica di Mare is about from the Tyrrhenian Sea near the top of a slope descending to an alluvial shelf on which the Pratica di Mare Air Force Base has been placed. It has the historical distinction of being the airfield from which Otto Skorzeny flew Mussolini to safety in Germany after his rescue from imprisonment in a mountain villa. Today the base is both a secure airport for the protection of distinguished visitors to the Rome region and a home for air shows of advanced aircraft. The Fosso di Pratica was re-routed around the end of a runway; however, today's small brook is in no way compatible with the concept of a port. The sea may well have formerly extended up to the base of the hill, as sites further north, such as Ostia, appear to have retreated one or two miles inland. Ancient Roman seaside villas are no longer on the beach.