Gifu-Kakamigahara Air and Space Museum has both outdoor and indoor exhibits of civilian and military airplanes, prototypes, replicas, and scale models (especially rockets).

Opened in March 1996 near Japan Air Self-Defense Force Gifu Airbase. It's in a park-like area with a large hangar-type building filled with planes.
This is the entrance to the museum grounds. Nearest train station is Kakamigahara Shiyakusho-mae Station (Meitetsu Kakamigahara Line). Details below.