Kasumigajo Castle Ruins is just one of the landmarks located 1 mi (1.7 km) from central Nihommatsu, so you might want to stop by for a few pics during your trip.
Oyama Chusaku Museum is 0.3 mi (0.6 km) from central Nihommatsu, why not stop by during your stay. If you want to experience more of the culture Nihommatsu has to offer, head to Dake Onsen and Dairinji Temple.