Windsor Castle - "Windsor Castle is the oldest and largest occupied castle in the world. It is open to visitors throughout the year. Founded by William the Conqueror in the 11th century, it has since been the home of 39 monarchs. Today The Queen spends most of her private weekends at the Castle.There's a lot to see and do at Windsor Castle, so please allow enough time to make the most of your visit. We suggest between 1½ and 2 hours. The Castle is at the top of a steep hill, and the visitor route covers long distances. We recommend you wear comfortable shoes." "Windsor Castle is fully accessible. It is situated at the top of a steep hill, and long distances have to be covered on site. . .Changing Places facility is available on Engine Court" - www.rct.uk