In 2016, a series of destructive earthquakes struck Kumamoto Prefecture in southwestern Japan. When seen from afar, badly damaged Kumamoto Castle is gradually recovering the stately appearance it's famous for. But many parts, such as the main tower, remain off-limits, making it hard to get a full picture of the castle's actual condition. This program takes an in-depth look at a major, 20-year project to restore it to its former glory. The team includes veteran masons tasked with re-laying an estimated 100,000 stones in the castle walls. Skilled carpenters are also working to restore historic structures. And experts are interweaving traditional and cutting-edge technologies to reinforce the castle against future disasters.

To American photojournalist Regina Boone, her paternal grandfather was an enigma. He was a hard-working Japanese immigrant but was arrested on the day of the Pearl Harbor attack never to return home. Regina's father rarely spoke about him throughout his life. It was only 5 years ago on his deathbed that he asked Regina to find out the circumstances surrounding her grandfather's disappearance. Our camera follows her quest to uncover the trail of her missing Japanese grandfather.