The garra formation limestone caves were formed during the Devonian Period four hundred million years ago. The Cathedral Cave features the magnificent and inspiring 15 metre tall calcite covered limestone formation where church services were once held from the 'Pulpit' in bygone years. The Gaden Cave has been stunningly lit to showcase a dazzling forest of stalagmites, stalactites, helictites, straws, shawls and unique cave coral. The Gaden Cave is an underground kingdom. The Phosphate Mine is a completely restored underground mine that operated from 1914 to 1918. The mine features the Bone Cave where extinct megafauna bones were first discovered.