What are the Dover castle's defenses?

Dover Castle, often referred to as the "Key to England," features impressive defenses including high cliffs, thick stone walls, and a well-fortified keep. Its strategic location provides a commanding view of the English Channel, while the castle's intricate system of tunnels and underground chambers enhances its defensive capabilities. Additionally, the castle's multi-layered fortifications were designed to withstand both sieges and naval attacks, making it one of the most formidable castles in England. Over the centuries, it has been adapted and reinforced to meet evolving military needs.