Scottish Architecture. Chambered Cairn 21 February 2024 · 1 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... Please share me.PostWhatsAppMastodonLike this:Like Loading...Thank you for Sharing me.