Fingal's Cave Fingal's Cave Fingal's Cave is a sea cave on the uninhabited island of Staffa, in the Inner Hebrides of Scotland, known for its natural acoustics. The National Trust for Scotland owns the cave as part of a National Nature Reserve. It became known as Fingal's Cave after the eponymous hero of an epic poem by 18th-century Scots poet-historian James Macpherson. Fingal's Cave is formed entirely from hexagonally jointed basalt columns within a Paleocene lava flow, similar in structure to the Giant's Causeway in Northern Ireland and those of nearby Ulva. In all these cases, cooling on the upper and lower
Cave of the Crystals of the crystals. As the cave's accessibility is dependent on the mine's water pumps, when mineral exploitation is ended in the area it was likely pumping would stop and water level allowed to rise again. In February 2017, Penelope Boston reported to the BBC that mining operations had ceased and that the caves have re-flooded. Cave of the Crystals Cave of the Crystals or Giant Crystal Cave () is a cave connected to the Naica Mine at a depth of , in Naica, Chihuahua, Mexico. The main chamber contains giant selenite crystals (gypsum, CaSO·2 HO), some of the largest natural