Windsor Castle Tour From 54€! And more The Windsor estate is the largest and oldest inhabited castle in the world. It is not only one of the official residences of the British monarchy, but also an amazing synthesis of nine hundred years of British history. In 1066 William the Conqueror chose this location west of London due to its strategic position on the Thames River. Since that time, all major events that occured from the conquest of Sir William to present time always took place near the Windsor Castle and are closely linked to the history of the British kingdom. The castle has had a great significance in British history throughout the years as it has seen the many trends and tastes of various rulers who succeeded one another. The castle extends over 45,000 square meters on an artificial hill and is one of the favorite residences of the monarchy. Queen Elizabeth II spends many weekends there and a flag that is hoisted on the round tower of the complex indicates her presence at the castle. Nevertheless, several areas of the castle open to the public are waiting to be discovered! This is a wonderful opportunity to immerse your self in a real fairy tale atmosphere!