Genbudo Cave Park, located on the right bank of the Maruyama River, features columnar joints formed by the cooling of lava approximately 1.6 million years ago. There are five caves: Genbu, Seiryu, Byakko, Minami-Suzaku, and Kita-Suzaku. From the shortest 15-minute two-cave tour to a 30-minute circular tour, visitors can enjoy the patterns on the rock face up close. The Japanese name for basalt comes from the local "Genbudo" cave. The hexagonal and honeycomb-like cross-sections of the rock face make for excellent photos.

Genbudo Cave is approximately 150 meters long, reaching up to 15 meters high and 10 meters wide. The cave features a tortoiseshell-shaped ceiling and five- to eight-sided stone pillars, captivating visitors with their mystical beauty.

At the Genbudo Museum at the foot of the mountain, visitors can experience exhibits and hands-on activities related to minerals, fossils, and Toyooka Kiryu crafts, as well as a dinosaur fossil zone. There's also a cafe where you can take a break.

It's only about a 10-minute drive from Kinosaki Onsen, so it's a spectacular spot worth stopping by if you're in the area.

[Trivia]
- Genbudo Cave is also of great academic value. In 1929, the rocks that led to Dr. Motonori Matsuyama's world-first publication of the "geomagnetic reversal" were discovered here.
- The caves are arranged in the following order: Genbu → Seiryu → Byakko → Minami-Suzaku → Kita-Suzaku. The shortest route is to visit both Genbu and Seiryu caves.

[Useful Tips]
- The park has many stone steps and unpaved areas, so some areas can be slippery. Wear comfortable walking shoes.