Rain clouds are lit by the setting sun, looking south from Hadrian's Wall near Hexham in northern England August 24, 2013. Hadrian's Wall is a structure built in Roman times, marking the boundary of the Roman province of Britannia and separating it from territory to the north, much of which lies in present-day Scotland. It became a UNESCO World Heritage Site in 1987. Signs of ancient conflict - from centuries-old fortifications to historic battlefields - score the landscape around the English-Scottish border. But many living in the region lead lives straddling both sides, and express practical concerns about the possibility of a more formal split between the two nations in the event of a yes vote in next year's referendum on Scottish independence, which will be held on September 18, 2014. Picture taken August 24, 2013. REUTERS/Toby Melville (BRITAIN - Tags: SOCIETY TRAVEL POLITICS TPX IMAGES OF THE DAY ENVIRONMENT)

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