Ancient fort was built on a sea stack near Stonehaven , Aberdeenshire . Archaeologists needed to use ropes to secure the summit for the excavation . They found traces of stone walls , ramparts and a partially filled ditch . excavations suggested 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 .