Underground delight: Check out this cave in Wales that is now the world's biggest trampoline

[caption id=“attachment_88942” align=“alignleft” width=“860”] A huge slate cavern in North Wales has been installed with the world’s biggest underground trampoline and is set to open on 4 July. This giant underground playground is the first of its kind in the world and the structure was dug out by hand for 4500 hours to remove 500 tons of rubble.[/caption]

[caption id=“attachment_88945” align=“alignleft” width=“860”] Unlike anything seen before, three huge trampolines are hung in the old slate cavern at varying levels, linked together by 60ft slides. The trampolines called the Bounce Below has been developed by the Zip World group. [/caption]

[caption id=“attachment_88946” align=“alignleft” width=“860”] Visitors are taken to the impressive 100 x 60 foot cavern by an old mining train and kitted out in special overalls and a helmet before being let loose in the caves to bounce and climb. The cave is located near the historic town of Blaenau Ffestiniog [/caption]