Poolbeg Lighthouse

This guide to Poolbeg Lighthouse in Dublin traces the deadly sandbank at the mouth of the Liffey that sank ship after ship, from the 1735 lightship stationed to warn sailors to the nearly four-mile Great South Wall built stone by stone to tame it. You'll hear how workers shifted from oak piles to granite hauled from the Dalkey quarries, and why the tower at the wall's tip ended up painted red. It's a story of infrastructure built entirely to answer one hazard.