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Photo: Spike, CC BY-SA 4.0 via Wikimedia Commons
There's been a beacon here since the 5th century, and the tower was completed by 1240, so it's among the world's oldest lighthouses. It's a 35-m-high with four storeys: in the top chamber monks tended the beacon fire and later the lantern. Secular lighthouse keepers took over from the 17th century, until it was automated in 1996.
The Hook Lighthouse is a building situated on Hook Head at the tip of the Hook Peninsula in County Wexford, in Ireland. It is one of the oldest lighthouses in the world and the second oldest operating lighthouse in the world, after the Tower of Hercules in Spain. It is operated by the Commissioners of Irish Lights, the Irish lighthouse authority, and marks the eastern entrance to Waterford Harbour. The current structure has stood for over 800 years.
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This is a star fort built by Elizabeth I of England in 1587/88 against Spanish attack; it's over the site of earlier fortifications. Visit by guided tour.
This Cistercian abbey was founded in 1200 by the Earl of Pembroke, who'd vowed to do so if the heavens preserved him when his ship was caught in a storm. It was populated by monks from Tintern Abbey in Wales, which by way of disambiguation was dubbed Tintern Major while the new abbey was Tintern de Voto — "of the Vow". It was dissolved in 1539 and the lands passed to the Colclough family until the 20th century. It's a substantial ruin with nave, chancel, tower, chapel and cloister, set in wooded parkland with walking trails.