The Caves of Ægissíða

The Caves of Hella (Icelandic pronunciation: [ˈhɛtla], also known as the Caves of Ægissíða [ˈaijɪsˌsiːða]) are a series of ancient man-made sandstone caves located at the farm Ægissíða on the bank of the river Ytri-Rangá, just across from the village Hella, in the southern part of Iceland. Through the past centuries the caves have been used by Icelandic farmers as sheep sheds, barns and, food storage. Nobody knows for certain who made them and for what purpose. However, throughout the centuries the people of Ægissíða have said the caves were built before the Viking settlement, most likely by Celtic monks.

Cave data from Wikidata (CC0). Summary from Wikipedia (CC BY-SA).