The original Kawagoe Castle was a massive Edo-period fortress, eight times its current size, featuring 9 enclosures and 13 gates. Today’s ground plot is a fraction of that scale, centered on the surviving Honmaru Goten palace. Its single-story Shoin-zukuri layout highlights a grand entrance, ceremonial Tatami halls, and defensive Nightingale corridors surrounding inner gardens. Most of the former castle grounds are now public parks and schools, leaving only the palace, the Fujimi Yagura hill, and the Nakanomon-bori moat as historical remnants.