A wind farm developer has paid for archaeologists to scan a cluster of seven Neolithic horned cairns near to where 21 turbines will be erected.
The 5,000 year old structures at Hill of Shebster, near Thurso, in Caithness, were used for burials and rituals.
Light Detection and Ranging (LiDAR) equipment was used to map the cairns.
Edinburgh-based AOC Archaeology also recorded 300 new Bronze and Iron Age sites in the £100,000 project funded by Baillie Wind Farm.
The new sites included hut circle settlements.