Standing at the very tip of the Hook Peninsula in County Wexford, Hook Lighthouse has been guiding ships through the waters around Waterford Harbour for more than 800 years. The present medieval tower was built during the early 13th century and is regarded as the oldest intact operational lighthouse in the world. Long before the tower existed, monks are believed to have kept warning fires burning on the headland to help sailors avoid the dangerous rocks around Hook. The area became known as Rinn Dubháin — Dubhán's Headland — after the monk who is said to have established a monastery here during the fifth century.

The construction of the great stone tower is associated with William Marshal, Earl of Pembroke and Lord of Leinster — one of the most powerful and influential knights in medieval Europe. Through his marriage to Isabella de Clare, daughter of Strongbow and Aoife MacMurrough, Marshal inherited extensive territories in Ireland. He developed New Ross as a major port, but ships approaching it first had to safely navigate the dangerous waters around Hook Head and Waterford Harbour. So Marshal had a lighthouse tower built. Its purpose was simple but enormously important: guide ships safely towards his new port. The tower was purpose-built as a light tower — not an old building later converted — and much of that original medieval structure remains today. William Marshal also built Trim Castle in County Meath — the largest Anglo-Norman castle in Ireland — and the two sites together tell the story of Norman power in medieval Ireland better than almost anywhere else.

The best way to experience Hook Lighthouse is the guided tower tour. Access to the tower is by guided tour only — you can't wander up independently. The tour lasts approximately 45 minutes and takes you through the different levels of the medieval tower, covering the story of St Dubhán, William Marshal, the construction of the lighthouse and the generations of lightkeepers who maintained the beacon. Then comes the climb: 115 steps. These aren't modern stairs. You're inside an 800-year-old stone tower. Some sections are narrow, the stone can become damp, and the steps have been worn by centuries of use. Hold the handrail and take your time. Then you reach the balcony.

Step onto the viewing balcony and you've got a 360-degree panorama. Waterford Harbour lies to the west. The Celtic Sea stretches south. The Hook Peninsula runs away behind you. The lighthouse is surrounded by open sea on three sides, which makes the top feel wonderfully exposed — and you suddenly understand exactly why this point was chosen for a lighthouse. For hundreds of years, the light above your head helped guide ships safely through notoriously dangerous coastal waters. And this isn't a retired lighthouse preserved purely for tourism. Hook Lighthouse is still operational. Irish Lights operates the navigational light, which today flashes approximately every three seconds.

After the tour, don't immediately get back into the car. Spend time exploring the coastline around the lighthouse. The exposed limestone landscape is beautiful — pools and channels appear among the rocks, waves crash dramatically against the shoreline, and the lighthouse looks brilliant from almost every angle. The rocks around Hook Head are also fascinating in their own right: much of the point consists of Carboniferous limestone containing fossils, meaning you're walking across rock formed hundreds of millions of years ago. Keep an eye on the rock surfaces and you may notice fossil patterns. Hook Head is also an excellent place to watch for marine wildlife — seals, dolphins and whales can all be seen in the waters around the peninsula, with winter particularly good for whale watching.

The lighthouse should be only one part of your day. The wider Hook Peninsula is packed with beaches, historic sites, small harbours and coastal scenery. Tintern Abbey — a Cistercian abbey founded around 1200, also by William Marshal — is one of the best places to combine with Hook Lighthouse, and the two connect directly through the Norman history of southeast Ireland. Nearby Slade Harbour is a lovely little stop, with fishing boats within the harbour walls and the exposed coastline stretching around the headland. Baginbun Beach is historically significant as the landing point of Anglo-Norman forces in 1170, and Duncannon on the western side of the peninsula has a long sandy beach and the impressive Duncannon Fort with more than 450 years of history.