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Home to 572-square-miles of protected night sky, Northumberland is blessed with some of the darkest skies in the whole of Europe. The longest section of the Northumberland 250 takes you on an unforgettable journey into the most isolated corners of England where you can experience the wonders of the universe as you’ve never seen before. Visit Northumberland’s only UNESCO World Heritage site, England’s largest forest, and a world-famous tree along the way.