The beautifully reconstructed wooden fortress, also known as the Castle in the Sky, dates back to the mid-16th century.
The crystal-clear river runs through the center of town. In summer, it's a playground for kids.
Gujo-Hachiman is famous for its ayu sweetfish, some of the tastiest in Japan. The traditional fishing method here, dating to the Edo period (1603-1868), is named yana after the bamboo platform that traps the fish during spawning season, from the end of September through October.
It's about three and a half hours from Tokyo to Gujo-Hachiman by Shinkansen to Nagoya with a transfer to local trains.