Dan yr Ogof is a 17-kilometre long cave system in south Wales, within the Brecon Beacons National Park. It is the main feature of a show cave complex which is claimed to…

Dan yr Ogof is a 17-kilometre long cave system in south Wales, within the Brecon Beacons National Park. It is the main feature of a show cave complex which is claimed to…
#great britain, #stalagmites, #Stalactites, #spelunking, #wales