Hidden underground in a 176-year old man-made cavern in North Wales is a giant adventure playground called Bounce Below. Giant trampolines, walkways, slides and tunnels all made from netting are suspended inside a cavern twice the size of St Paul's Cathedral at the disused Llechwedd slate mine near Blaenau Ffestiniog.

The bouncy nets are hung at different levels, the highest being 180ft up from the bottom of the cavern, and are linked together by walkways, tunnels and slides. It takes about an hour to bounce, slide and crawl from the top of the cavern to the bottom, allowing kids to burn off some energy during school holidays.

Bounce Below Zip World Caverns
Oli Scarff/Getty Images
Bounce Below Zip World Caverns
Oli Scarff/AFP
Bounce Below Zip World Caverns
Oli Scarff/AFP
Bounce Below Zip World Caverns
Oli Scarff/AFP
Bounce Below Zip World Caverns
Oli Scarff/AFP
Bounce Below Zip World Caverns
Oli Scarff/AFP
Bounce Below Zip World Caverns
Oli Scarff/AFP

The mine is also home to Zip World Caverns – a network of underground zip lines, rope bridges and tunnels. The experience is suitable for adults and children aged 10 and above and lasts up to three hours.

Bounce Below Zip World Caverns
Oli Scarff/AFP
Bounce Below Zip World Caverns
Oli Scarff/AFP
Bounce Below Zip World Caverns
Oli Scarff/AFP