Welcome to one of the most iconic strongholds in the world. As you stand here at the summit of the Royal Mile, you are actually resting on the remains of a volcanic eruption that happened 350 million years ago. This massive plug of black stone, known as Castle Rock, rises 80 meters above the city and provided a natural, near-vertical defense for the early people who lived here nearly 3,000 years ago. Over the centuries, this site evolved from a prehistoric hillfort into the most besieged place in Great Britain. As you move through the gates, imagine the countless generations of soldiers, kings, and queens who have walked these same steep paths, making this fortress the very soul of Scotland.