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This water themed walking tour through Hyde Park will uncover the history of the underground rivers and reservoirs that flow beneath it, take a closer look at it's ancient monastic fish ponds and explain how the park ensures the Diana Memorial Fountain remains flowing all year round. It's going to be a wintry walk, so wrap up warm and be prepared for the water to have turned to ice. Meet outside the Serpentine Bar & Kitchen and book tickets in advance.