Monkman and Seagull visit Wales, which is known for its strong industrial engineering flavour. They begin by sailing across the highest navigable aqueduct in the world – The Pontcysyllte Aqueduct. Next, the tiny village of Hawarden gives the brainy duo the opportunity to stay overnight in the UK’s only residential library, surrounded by former Prime Minister William Gladstone’s unique collection of books. Later they travel to Mount Snowdon and visit a former quarry hospital in Llanberis.
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