Ancient fort was built on 20-foot sea stack near Aberdeenshire , Stonehaven . Archaeologists needed to use ropes to reach the summit for the excavation . They found remains of stone walls , ramparts and a charcoal filled fireplace . Experts believe it may have been one of a line of forts along Scottish coast .
Ancient fort was built on 20-foot sea stack near Stonehaven , Aberdeenshire . Archaeologists needed to use ropes to reach the summit for the excavation . They found remains of stone walls , ramparts and a charcoal filled fireplace . Experts believe it may have been one of a line of forts along Scottish coast .