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Plantsman Paul Hervey-Brookes visits two of Northern Ireland’s most remarkable landscapes: the dramatic basalt columns of Giant’s Causeway, a UNESCO World Heritage Site shaped by ancient volcanic activity, and the magnificent gardens of Mount Stewart House, where formal Italian-inspired design and the region’s mild climate create an extraordinary horticultural masterpiece. Paul reveals the history, beauty and unique character that make these destinations among the British Isles’ greatest natural treasures.