Wales - Dan-yr-Ogof Showcaves - 'The Waterfalls' - Dan-yr-Ogof is the largest show cave complex in western Europe with, as they say, award winning lighting and sound system. In 1912 the two brothers, Tommy and Jeff Morgan, of Abercrave, entered Dan-yr-Ogof via a small passage, which can just be seen inside the short mined tunnel, now connecting the end of the dry passages with the outside world. They used candles and oil lamps and marked their route through the caves with arrows of sand or mud. They crossed Coracle Pool by coracle, which gave it its present name. The cave has multiple formations. Outstanding is the huge, 5.5m long hanging curtain at Cauldron Chamber. It is a river cave with numerous lakes, pools, waterfalls and bridges. A small part of the cave at the end called Jubilee Passage, is not accessible when the water rises. But this is only after long and heavy rains. The cave is lighted with electricity, which is produced from the cave river. The Morgan brothers installed a water turbine they got used from France. It is still working today and producces 20 kW, which is sufficient to light the show cave.