Edinburgh Castle is Scotland’s most popular visitor attraction,” Dr Murray said. “More than 1 million visitors are drawn each year by its spectacular location and history. They can see the Crown Jewels, the One O’Clock Gun and the Stone of Destiny as well as the Great Hall, St Margaret’s Chapel, and Mons Meg. “This new exhibition will explore more of the castle’s complex story, with links to Scots-born John Paul Jones – renowned in America as founder of the US Navy and in Britain for capturing one of the Royal Navy’s warships – and the turbulence of revolutionary Europe at the end of the 1700s.”Edinburgh Castle is a world-class attraction and today’s well-traveled tourists have high expectations.”The vaults at Edinburgh Castle were constructed around 1500 and later used as soldiers’ barrack-rooms and a bakehouse. However they were used for many years as prisons of war from the 1750s into the early 1800s. Graffiti carved into prison doors reveal the names and sentiments of many of the men there, and some of them etched crude drawings of their vessels. One drawing shows a gallows and noose, with the inscription Lord Nord (North) – the British Prime Minister at the time of the American War of Independence. Another shows a ship flying what appears to be the stars and stripes: one of the earliest known depictions of the American flag.