Hikone Castle is one of few castles in Japan that remains relatively unchanged since it was built in the early 1600s, and it has been designated a National Treasure. The castle employs numerous ingenious devices to deter enemy attacks. It is a sturdy fortress, yet boasts a grand, decorative facade. What is fascinating is that much of the materials and buildings were recycled from other nearby castles. But why? History and castle buff Chris Glenn delves into and reveals Hikone Castle's secrets.