For being the oldest donjon in Japan, it is in excellent condition. What's even more amazing is that they brought the donjon from another site and added it to the existing castle.

Inside the donjon is the usual varnished wooden floors,
very tall steps, and a few displays.

From the top floor of the main tower, visitors can see Inuyama City, the Kiso River, the Nobi Plain, and the peak Kiso-ontake.