Carisbrooke Castle has anchored the Isle of Wight as a central fortification for over 1,000 years, beginning as an Anglo-Saxon earthwork defence against Viking raids. The Normans constructed the iconic shell keep atop a towering mound, offering visitors panoramic island views from its summit, while later remodelling under Elizabeth I enhanced its medieval features. The castle achieved historic fame as the prison of King Charles I following his Civil War defeat and later became the summer residence of Princess Beatrice, Queen Victoria's daughter. Today's visitors encounter the beloved Carisbrooke donkeys demonstrating the treadwheel mechanism that once raised water from the castle well, explore the museum housed in the Great Hall and historic lodgings filled with Charles I memorabilia, and walk the castle walls amid gardens and interactive exhibits managed by English Heritage.