The Guardian of the Valleys is a huge figure of a miner by Sebastien Boyesen on the site of Six Bells coal mine, where 45 people died in an underground explosion in 1960. It is a monument completed for the 50th anniversary of the disaster in 2010. The designer made it 20 m high to be seen from far away. It is made of 20,000 strips of steel that make it see-through from some viewpoints but like solid metal from others.