Home to a variety of unique and interesting objects, Saga Prefectural Nagoya Castle Museum is a terrific place to learn more about times gone by. Check to see if there are any guided tours available or just roam around at your own speed.
You'll be spoiled for sightseeing choice when spending time in Karatsu. Saga Prefectural Nagoya Castle Museum is a great place to begin here, but there are lots of other interesting places to consider. Yobuko Morning Market, Yobuko Ohashi Bridge, and Nanatsugama are close to the collection of historical artifacts and and will cap off your day nicely.