Quanterness chambered cairn - Credit: Wikimedia Commons
Quanterness chambered cairn is a Neolithic burial monument located on Mainland, Orkney in Scotland. An Iron Age roundhouse built into the cairn was discovered during excavation in the early 1970s. The dwelling was constructed around 700 BC. Also found during excavation, were the remains of 157 people, pottery remnants and other artefacts. Historic Environment Scotland established the site as a scheduled monument in 1929. Read more on Wikipedia
Source: en.wikipedia.org