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The National Maritime Museum tells Britain's ocean story as a web of ventures, risks and reckonings. Nelson's Trafalgar coat, pierced and preserved, anchors the human cost beneath grand narratives. Nearby, the 'Sea Things' wall turns thousands of curiosities into a mosaic of everyday seafaring. Pacific Encounters reframes oceans as cultural highways, while Polar Worlds weighs courage against cold and logistics. Time and Longitude reveals the elegance of navigation-precision as empire's quiet engine. Galleries are spacious, family-friendly, and rich with interactives without losing scholarly backbone. Entry is free; special shows vary. Pair with Greenwich Park, the Queen's House or the Observatory, and budget ninety minutes to three hours.