Mysterious, Abandoned and Derelict!

Three challenges in one bit of BackBlippery!

The mysterious ruined remains of Dunskey Castle, perching atop the cliffs overlooking the Irish Sea. I poked about, surveilled with great suspicion and much cawing clamour and shrieking from the rooks above, who clearly marked this out as their territory, something no gulls dared to challenge so far as I could see. How it fell into such utter ruination is a mystery to me, being in such a strategic, and desirable, location.