Dover Castle, located in Dover, England, is a historic fortress that dates back to the 11th century. Built by King Henry II, it served as a strategic military stronghold due to its proximity to the English Channel. The castle features impressive defensive structures, including a massive keep and extensive walls. The castle has played a significant role in various historical events, including the Napoleonic Wars and both World Wars. Today, it is a popular tourist attraction, offering visitors a glimpse into medieval life and stunning views of the surrounding landscape.