ighth ouse ▁is ▁the ▁Holy head ▁Mail ▁Pier ▁Light . ▁It ▁was ▁designed ▁by ▁John ▁R enn ie ▁the ▁E lder ▁in ▁ 1 8 2 1 , ▁although ▁he ▁died ▁before ▁super vis ing ▁the ▁construction . ▁It ▁is ▁one ▁of ▁the ▁few ▁surv iving ▁examples ▁of ▁R enn ie ' s ▁work . ▁The ▁l ighth ouse ▁was ▁su pers eded ▁by ▁the ▁Holy head ▁Break water ▁L ighth ouse ▁when ▁the ▁new ▁har bor ▁opened ▁in ▁ 1 8 7 3 . ▁ ▁Pier ▁ ▁The ▁main ▁pier ▁on ▁the ▁island , ▁the ▁Admir alty ▁Pier , ▁was ▁opened ▁in ▁ 1 8 2 1 . ▁At ▁around ▁ ▁long ▁it ▁extends ▁east ▁into ▁the ▁sea ▁and ▁has ▁been ▁used ▁to ▁handle ▁fer ry ▁traffic ▁since ▁it ▁was ▁opened . ▁Due ▁to ▁its ▁important ▁historical ▁links ▁between ▁Great ▁Britain ▁and ▁Ireland , ▁the ▁pier ▁has ▁twice ▁had ▁royal ▁visitors , ▁once ▁on ▁ 7 ▁August ▁ 1 8 2 1 ▁when ▁King ▁George ▁IV ▁arrived ▁from ▁Ireland ▁and ▁once ▁in ▁ 1 8 9 8 ▁when ▁Queen ▁Victoria ▁set ▁sail ▁for ▁her ▁last ▁voyage ▁to ▁Ireland . ▁ ▁An ▁inner ▁arm , ▁pair ing ▁the ▁existing ▁ ▁long ▁break water ▁( built ▁between ▁ 1 8 4 8 – 1 8 7 6 ) ▁was ▁planned ▁from ▁Salt ▁Island . ▁The ▁isolated ▁broad ▁gauge ▁tram way ▁railway ▁from ▁the ▁Holy head ▁Mountain ▁quar ry ▁used ▁to ▁build ▁the ▁former ▁had ▁a ▁branch ▁to ▁Salt ▁Island , ▁via ▁New ry ▁Beach