“Naegi Castle Ruin” is situated at Naegi, Nakatugawa-shi. This is a mountain castle designated as a national historical ruin. Its stone wall (ishigaki) was built in a rare manner using natural huge rocks. A landscape from its observatory is splendid. You can enjoy a magnificent, panoramic view containing Mt. Ena, Kiso River and even urban districts. Near the castle ruin entrance, there is the “Naegi Historical Toyama Museum” exhibiting precious materials relating to Naegi Castle and also helping those tourists who look for a guide to give them a tour of the castle ruin.