Rochester Castle is a historic fortress located in Rochester, Kent, England. Built in the 12th century, it was originally constructed by William the Conqueror to defend the area and assert control over the region. The castle features a well-preserved stone keep, which is one of the tallest in England, and has played a significant role in various historical events, including the First Barons' War. The castle's strategic position along the River Medway made it an important military site throughout the centuries. Today, Rochester Castle is a popular tourist attraction, offering visitors a glimpse into medieval life and stunning views of the surrounding landscape.