Arthur's O'On

Arthur's O'on was a stone building thought to be Roman temple that, until 1743, stood on rising ground above the north bank of the River Carron not far from the old Carron ironworks in Stenhousemuir, near Falkirk, Scotland. The structure is thought to be the 'stone house' which gave its name to Stenhousemuir. Early historians discussed historical and mythical associations with the site and by 1200 the estate of Stenhouse on which it stood had been named after it.

Source: Wikipedia