English: "Fulacht Fiadh" cooking pit, Irish National Heritage Park There are many remains of this type of pit in Ireland, over 4,000, and many theories about the way they were used. They were in use from 1500 B.C. up to medieval times. The most common theory is that meat - particularly venison - was placed in water in the pit, stones were heated in fires and thrown into the pit, and the meat cooked. Similar pits can be seen at the Tomb of the Eagles in the Orkneys. For more photos in the park, see https://www.geograph.org.uk/gallery/irish_national_heritage_park_county_wexford_10033 .