Windsor Castle, the oldest and largest occupied castle in the world, is a must-visit for history buffs and royal enthusiasts alike. Founded by William the Conqueror in the 11th century, this iconic landmark has been home to 40 monarchs over the years. Visitors can explore the State Apartments, St George's Chapel, and even marvel at Queen Mary's Dolls' House. With plenty of shops, cafes, and activities for children and families, Windsor Castle offers a fascinating glimpse into centuries of royal history in a stunning setting.