10Windsor Castle, Berkshire

Windsor Castle is not only the largest inhabited castle in the world but also one of the official residences of the British monarch. Founded by William the Conqueror in the 11th century, it has been home to 40 monarchs over nearly 1,000 years. Visitors can explore St. George’s Chapel, the exquisite State Apartments, and the magnificent Long Walk. As a working royal residence, Windsor Castle uniquely blends living history with architectural splendor.