Edinburgh Castle is a world famous icon in Scotland and part of the Old and New World Heritage Sites of Edinburgh cities, it is Scotland's number one tourist attraction. This most famous castle has a complex building history. Mar Margaret's Church dates back to the 12th century and is the oldest part; The Great Hall was built by James IV around 1510 AD, and the castle includes the Crown of Scotland jewels, the Stone of Destiny, the famous Meg’s gun dating back to the fifteenth century, the one o’clock gun, and the National War Museum in Scotland.