Looking around, I find that the Sacra di San Michele has a very nice little set of virtual tours on its website. The Benedictines were removed in 1622 after a period of long decline, and as MrsD noted in previous comments, it has been maintained by the Rosminians since 1836. It has also been adopted as the monumental symbol of Piedmont, so the regional government has been actively working for the past two decades to renovate it.
