Many shell matrix sites were created when shells were thrown away after being eaten, but there are various alternative uses for shell matrix site, such as making concrete by burning the shells, using shells as ingredients for crafts, sprinkling shells when burying the dead, using shells for constructing roads, etc. The Mae-araya site, the only known shell matrix site in old Kamogawa city, is estimated to be a food-waste shell matrix site judging from the types of shells, shapes and other remains. The main shell species are Unbonium giganteum (Giant button top) and Crassostrea gigas (oyster). Judging from the scattered pieces of clay-pottery, it can be a shell matrix site from ancient times to the medieval times.

Toshoji temple is built on a hillside near the summit of Mt. Mineoka. At Toshoji temple, visitors can see wooden pagodas and sekido (stone monument tower) rare in Chiba prefecture. Also, an earth ring (a base layer of a gorinto stupa) which seems to be from the medieval times remains. The downstream, right bank area in Kamogawa river has many medieval ruins such as Takisanji temple, a cluster of gorinto stupas at Raishu, Toshoji temple, Guminokida site and Mae-araya site - and if each one, such as settlements, castles, paddocks, cemeteries and places to pray, is observed thoroughly, the atmosphere of the village at the time subtly emerges.

Daily management of the Mineoka Ranch was carried out by a makishi (a ranch manager) appointed from a local farming family, but other farming families were forced to work 20~30 days a year for ranch management. It is said that the peasants became to live in misery as the time for ranch management operations and the time that was vital for rice farming often overlapped each other. It is said that there was Ohura wooden gate near the Noma bank, which remains in Issemba Park, for people to come and go between the ranch and other villages around_ however, there is a possibility that the information needed to clarify the fact was destroyed, since park construction was carried out without it being investigated.

Yagumojinja Shrine commands panoramic views of the houses of Isomura Village (which was a fishing village), the Kamogawa fishing port, Bentenjima Island, Arajima Island and the vast ocean which is also a fishing ground. In 1833, a carry-float was first put on display during a festival of Benzaiten (god of fortune) at Itsukushimajinja Shrine, the guardian god of fishery, on Benten Island. The carry-float represents a small boat floating among the waves and the hayashi (musicians) on the carry-float expresses the emotions of fishermen, and the musicians keep playing music no matter how vigorously swung.

This is a Jodo sect temple that was in Naraihara, but it was burnt down in the war fires of the Satomi clan's civil war, and it was relocated to Isomura Village and rebuilt by Masaki Michitoshi in 1577, and again relocated to Kaisuka in 1930. In Shinganji Temple, there are 23 religious masks that were used by monks during rituals _ which took place in Buddhist ritual meetings or memorial services - in which they formed a long procession while reading scriptures. Together with Jodo-mandara, they evoke images of Jodo worship.

As you walk up a trackless trail of Shinganji Temple's back mountain, you encounter a cliff about 10m high. A magakibutsu (image of Buddha carved into a rock face) on a stone monument, in which Buddhist image is expressed with Shuji script, has been line-carved. The fact that it was made in Bunka period in commemoration of Shikoku-henro pilgrimage is inscribed on it, along with the names of people who made it.