For countless thousands of years the Marble Arch Caves lay undisturbed in inky black, primeval darkness, while the cave river eroded and dissolved away millions of tonnes of limestone to carve and shape the majestic cave passages.
Rank upon rank of stalactites grew slowly from the cave roof in pitch darkness where a person could spend a lifetime in the cave and never see their hand in front of their face...
The Marble Arch Caves are just one of the numerous extensive cave systems found in the Geopark; the existence of caves in these areas can be attributed to the underlying Geology.