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In Celtic mythology there is a legend of a cave called "Cruachan," also known as "Ireland's gate to Hell," a mythical and ancient cave from which according to legend strange creatures would emerge in ancient times and be seen on the surface of the earth.^[6] There are also stories of medieval knights and saints who went on pilgrimages to a cave located in Station Island, County Donegal in Ireland, where they made journeys inside the earth into a place of purgatory.^[7] There is an Irish myth which says tunnels in County Down, Northern Ireland lead to the land of the subterranean Tuatha de Danaan, a group of people who are believed to have introduced Druidism to Ireland, and then went back underground.^[8]