Dunnet Head from Burnside, Thurso

A day of bellringing in Thurso, and during the lunch break I went for a walk. Found my way to the shore, and was hoping for a blip of the snowy Hoy Hills, but they came out appallingly out of focus.  As an excuse, I was using a manual focus lens.  I assume the precariously perched building is a wartime lookout, but don't know for sure.