ies ▁at ▁regular ▁intervals ▁around ▁the ▁outer ▁wall , ▁allowing ▁covering ▁fire ▁at ▁all ▁angles . ▁A ▁redundant ▁wind mill ▁was ▁converted ▁after ▁ 1 8 3 1 ▁into ▁G arrison ▁Tower ▁as ▁a ▁look out ▁tower ▁for ▁H M ▁Coast guard . ▁ ▁The ▁Star ▁Castle ▁was ▁built ▁in ▁ 1 5 9 3 ▁by ▁the ▁Survey or ▁of ▁the ▁Royal ▁Works ▁and ▁map maker ▁Robert ▁Adams ▁( d . 1 5 9 5 ), ▁under ▁the ▁direction ▁of ▁Francis ▁God olph in , ▁following ▁the ▁Spanish ▁Arm ada ▁of ▁ 1 5 8 8 . ▁F ear ing ▁another ▁Spanish ▁invasion , ▁in ▁May ▁ 1 5 9 3 ▁Queen ▁Elizabeth ▁I ▁ordered ▁the ▁construction ▁of ▁a ▁fort ▁and ▁two ▁s con ces ▁as ▁a ▁look out ▁for ▁any ▁intr uder ▁ships . ▁ ▁In ▁ 1 7 4 0 ▁Master ▁Gun ner ▁Abraham ▁T ove y ▁transformed ▁the ▁G arrison ▁building ▁walls ▁with ▁gun ▁batter ies , ▁including ▁Colonel ▁Bos ca wen ' s ▁B atter y , ▁in ▁a ▁circular ▁shape ▁following ▁the ▁coast ▁line ▁of ▁The ▁H oe . ▁Star ▁Castle ▁is ▁now ▁a ▁hotel . ▁ ▁Pen inn is ▁Head ▁The ▁ 1 4 ▁met re ▁metal ▁tower ▁l ighth ouse ▁on ▁Pen inn is ▁Head ▁was ▁built ▁in ▁ 1 9 1 1 ▁as ▁a ▁replacement ▁for ▁the ▁ 1 6 8 0 ▁l ighth ouse ▁in ▁the ▁centre ▁of ▁St ▁Ag nes . ▁The ▁l ighth ouse ▁was ▁converted ▁from ▁ac et yl ene ▁gas