Old locomotives at the Bois du Cazier mining site in Marcinelle, near Charleroi. Four major mining sites of Wallonia, southern region of Belgium, joined the list of sites classed by UN cultural body UNESCO as world heritage, the organisation said at a meeting in St. Petersburg. The four historic sites Bois-du-Luc, Grand-Hornu, Bois du Cazier and Blegny-Mine are related to coal mining. - AFP - 2 July, 2012