The grange was a fortified farm that grew up in the place where, in medieval times, a hospice offered lodging to travellers following the Via Francigena. Situated in the Sienese countryside, in the midst of the vast estates owned by the Hospital of Santa Maria della Scala in Siena, it was a centre for the storage of grain and all of the agricultural production necessary for the hospital's activity. Its fortification, which served to safeguard the stores from incursions, represents an interesting architectural type. Today the most important granges are those of Monteroni, of Montisi and of Serre. In the latter, in 2001, the Museum of the Grange was inaugurated, divided into two sections, the Olive Oil Museum and the Grange Documentation Centre. The first of these museums, housed in an ancient olive-mill, displays a collection of implements and materials from the 20th century pertinent to olive-growing and the production of olive oil. The Grange Documentation Centre illustrates, instead, the development of these singular fortified centres. Four multimedia stations, in particular, offer a virtual tour of the building, while tracing its history within the system orbiting around the Hospital of Santa Maria della Scala. Today the Museum forms part of the Sienese Museum System.