Grottes de Calès (Caves of Calès) is an archeological site with many cave dwelling from prehistoric to medieval times. Most of the caves were dug by man to extract sandstone blocks of Molasse which leaves on place numerous made-man openings. It is not true arches of nature created by natural process of erosion. However some small natural arch can be found outside of the site on the hill around. The site of Calès is located on the hill above the village of Lamanon in Bouches-du-Rhône department of France.