TOPSHOTS Visitors experience 'Bounce Below', a network of giant trampolines, walkways and slides suspended in the caverns of the 176-year old disused Llechwedd slate mine near Blaenau Ffestiniog, North Wales on July 21, 2015. The adventure activity is a subterranean playground and features alongside 'Zip World Caverns', the world's largest fully underground zip line course. AFP PHOTO / OLI SCARFF