The vast Cuevas del Drach are huge grottoes containing crystal-clear lakes that stretch out for over 1,200m and are 25m deep. The vaults, covered in an amazing web of innumerable pointed icicles, are perhaps the most remarkable feature. The vast chamber in which Lago Martel lies, has been turned into an amphitheatre and hosts classical musical concerts. As you leave either by boat or over the footbridge, you will be treated to a light show.