Dover Castle is one of the largest and most significant medieval castles in the United Kingdom, located in the town of Dover. Majestically perched on the famous White Cliffs overlooking the Strait of Dover, it served as the country's primary defensive outpost for centuries. Due to its key strategic position, the castle earned the apt nickname "The Key to England," as it controlled the vital sea route connecting the island with continental Europe.
The castle's architecture is a classic concentric fortress that has been beautifully preserved to this day. At its center stands a massive rectangular keep—the Great Tower—which in its time was one of the largest structures in England. This powerful stronghold is surrounded by two sets of high, thick defensive walls, making the castle virtually impregnable and demonstrating the outstanding achievements of medieval military engineering.

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A visit to Dover Castle is a true journey through history spanning nearly two millennia, from Roman times to the events of the 20th century. Guests can explore not only the royal chambers inside the Great Tower but also descend into mysterious medieval tunnels and secret underground passages from the Second World War, which housed a command center. This site is fascinating not only for its defensive strength but also for its rich cultural heritage, making it a must-visit for anyone interested in English history.