FAI offers guided tours of unusual and rarely-opened historic sites across Italy.
The annual Giornate FAI d'Autunno initiative opens the doors to more than 650 historic and cultural buildings across Italy over the weekend of 13-14 October.
This year the Rome events include visits to the former headquarters of the Italian air force at the fascist-era Palazzo dell'Aeronautica, and a 1940s bunker housing a train signalling control centre under Termini station.
The guided tours, conducted by around 3,500 Fondo Ambiente Italia (FAI) volunteers, are free but visitors are encouraged to make a minimum donation of €3.
Similar to Britain’s National Trust, FAI works to preserve and highlight Italy’s cultural heritage through education, restoration, events and open days.
For details and full list of places to visit see FAI website.