This is Bounce Below (links to hours and ticket info), a series of interconnected trampolines suspended in an old slate mine in Blaenau Ffestiniog, North Wales (which is also home to the world's longest underground zip-line). The trampolines are suspended anywhere between 20-feet to 160-feet above the cavern floor. That must be exhilarating. Plus there's a constant technicolor light show to really make you feel like you're tripping. I suspect it's the work of cave dwelling trolls to lure human prey to themselves. "It's a tourist attraction." That's just what they want you to believe, but there will be no exiting through the gift shop. You're leaving through a troll's anus.
Keep going for several more shots.
Thanks to Rev Dr Dom, who promised to take me if I ever come to visit. Deal, but no stealing my bounces.