La Crau is a flat plain to the east of Arles, a landscape much beloved of Vincent van Gogh: rich farmland criss-crossed by canals, farmtracks and a railway line. To the north east are the Alpilles, a chain of limestone mountains, rich in bauxite. The first mountain is the Mont de Cordes which rises solitary from the plain and was once an island, and it's overlooked by another limestone ridge of Montmajour, on which was built a huge ugly fortress of an abbey, which dominates the view. The area is not only significant for me from a Vincent van Gogh point of view, but also because it holds a number of important, secret, prehistoric sites. As we were to discover many of these were 'acces interdit'.