When anthropologists think about bog bodies, their thoughts usually turn to Ireland. Waterlogged sections of land rich in dead plant material that has, over the centuries, converted to peat, provides not only a good source of fuel that has fired the homes and kitchens of Ireland for millennia, but, because of the unique environmental conditions they provide, have also served as an excellent preservative for bodies and artifacts that, either accidentally or not, are sometimes found buried in their embrace. Irish Celts considered bogs spiritually significant, offering gifts to their gods, and possibly human sacrifices as well. These human remains are called bog bodies, and offer a wealth of well-preserved information about the customs of past cultures. Some of them date back as far as 10,000 years.