At the SE end of Hoy
These defensive installations are remarkable remnants of war.
They were built in 1813-14 to protect British convoys during the Napoleonic Wars, and adapted during later conflicts. The Martello tower, one of only three surviving in Scotland, allows views towards Scapa Flow, a naval anchorage during both world wars.
Inside you can learn about military life and the ceilidhs and dances that locals held here.