Huntersquoy chambered cairn - Credit: Wikimedia Commons
Huntersquoy chambered cairn is a Neolithic chambered cairn located on the island of Eday, in Orkney, Scotland. The monument dates from the 3rd millennium BC and is an Orkney–Cromarty type chambered cairn. Huntersquoy is a distinctive two-story burial monument with overlapping chambers. Historic Environment Scotland established the site as a scheduled monument in 1936. Read more on Wikipedia
Source: en.wikipedia.org