World Heritage Sites
Once out of the urban centres in Mainland, there's a series of archaeological sites of great value and in very good condition. Many of them are of great antiquity, between 3000 and 5000 years old, all in choosen strategic locations. In many cases, the people tried to favour the gods. This is the case with "Stones of Stenness Straight" in the village of Stenness, on a mound just south of a lake that shares its name with the town. There's a perfect circle (of about 44 meter radius) of vertical and irregular stones of an average of 5 meters tall. This monument belongs to the Neolithic period and its function is believed to be purely religious, especially during sunset.