Amphitheater in the middle of a coal mine

At the very top of the "mining tip" of a gargantuan pile of rubble from the Halde Haniel Coal Mine in Bottrop, Germany sits an amphitheater built in 1999, which seats 800 people. Along the upper ridges of the man-made caldera sit lines of over 100 painted wooden "totems" made from railroad ties and set into concrete bases. The Prosper-Haniel coalmine was created in 1974 and is still in operation.