Carnglaze which means "blue rock pile" in Cornish, goes back long before the dinosaurs roamed the earth. The mud which would become the slate that is Carnglaze was being laid down underneath the seas from as long ago as 500 million years. Intense pressure and folding as a result of subsequent periods of earth movements resulted in those early deposits being metamorphosed into slate. Today Carnglaze Slate Caverns are a popular all weather tourist attraction, a booklet on the history of Carnglaze is available in the gift shop which also sells unique hand-crafted items from the slate craft workshop

Carnglaze consists of three underground caverns set in 6.5 acres of the picturesque wooded hillside of the Loveny valley at St. Neot, near Liskeard. You will be taken on a guided tour (which will last for about 45 minutes) through the three unique centuries old caverns of cathedral proportions, hand created by local slate miners. Within the complex is the famous subterranean lake with its crystal clear blue/green water. During the tour you will go about 100m into the hillside and 150m below ground. The caverns are a constant 10 degrees centigrade, so a jumper and sensible footwear are recommended. Due to popular demand Carnglaze is now open all year, from Monday to Saturday from 10am until 5pm with the last tour starting at 4pm.