The oldest stone house still standing in northern Europe (occupied from 3500 BC to 3100 BC) is at Knap of Howar on the island of Papa Westray, with walls intact to a low eaves height, and stone furniture looking very usable. Finely made and decorated Unstan ware pottery links the inhabitants to chambered cairn tombs nearby. At Skara Brae on the "Mainland", passageways connect similar houses into a village, dating from about 3000 BC to 2500 BC. Pottery found here is of the grooved ware style which was found at the Standing Stones of Stenness, close to the exceptional Maeshowe passage grave type chambered cairn of about the same period.