Edinburgh Castle, as Scotland's most important historical landmark, has witnessed its ups and downs for thousands of years. The construction of the castle dates back to the age of David I in the 12th century. Now there are buildings of that period in the castle: St. Margaret's Chapel. Since then, the royal family has lived here for generations. From the 16th century onwards, Edinburgh Castle gradually became a military fortress and prison. Until 1633, the function of royal residence was completely replaced by Hollywood Palace, which was at the end of the Royal mile. Edinburgh Castle is a story-telling castle, but the reasons for its world-famous include its unique shape, which is independent from the dead volcanic rocks at 130 meters high, overlooking all living beings. Its three sides are steep cliffs, natural defensive fortifications, such a geographical location makes it easy to defend and difficult to attack. In fact, the psychological security provided by appearance is greater than the actual security. In the centuries of Scotland's love affair with England, Edinburgh Castle was besieged 26 times by people and horses, and most of the sieges were successful! The main reason is that the water supply system is very fragile. Once the enemy cut off the water source or poisoned the water, the defenders can only surrender obediently. Today's Edinburgh Castle is not a single castle, but a complex of buildings formed on the top of volcanic rock after hundreds of years of repeated destruction, reconstruction and construction. The soul of the Middle Ages, the bloodstains of turbulent times, and the castle against the background of clouds are cold and mysterious.