Unstan Chambered Cairn

Unstan (or Onstan, or Onston) is a Neolithic chambered cairn located about 2 mi (3 km) north-east of Stromness on Mainland, Orkney, Scotland. The tomb was built on a promontory that extends into the Loch of Stenness near the settlement of Howe. Unstan is notable as an atypical hybrid of the two main types of chambered cairn found in Orkney, and as the location of the first discovery of a type of pottery that now bears the name of the tomb. The site is in the care of Historic Environment Scotland as a scheduled monument.