Kannonji Castle was located in Kinugasayama, a 432.7 meter low mountain popularly called Kannonjiyama, in Azuchi Town in Shiga Prefecture. It is a nationally designated Historic Site.

The origin of the castle is not clear, but it had been resided by generations of the Sasaki clan, the governor of Omi province. After the Sasaki clan was divided into the two clans, the Rokkaku clan and the Kyogoku clan, the Rokkaku clan lived in the castle. In 1568, during the time of Rokkaku Yoshikata and his son, Yoshiharu, the castle was attacked by Oda Nobunaga, who was on his way to Kyoto. The castle fell and dismantled.

Covering the whole mountain as the castle area, it is one of the few largest-scaled mountain castles in the Middle Ages in Japan. The ruins of stone works and earthworks remaining everywhere in the mountain suggest that the castle had many large and small compounds. The wall made of huge stones can be seen around Kannonjisho Temple, a Holy Place of the Saigoku Pilgrimage, near the top of the mountain. The mountain path serves as a good hiking course today.

Ono Castle, also called Miyayama Castle, was located at the top of Mt. Seikai in Tokoname City, Aichi Prefecture. The castle was resided first by the Ono clan, the descendant of the Owari-Genji family, then the Isshiki clan, and finally the four generations of the Saji clan.

The Saji clan built up Chita Suigun (the naval forces) and played an important role in promoting maritime trade and controlling marine transportation in Ise Bay. Oda Nobunaga and Toyotomi Hideyoshi placed great importance on their naval power and Nobunaga’s sister and niece were married off to the Saji clan.

Nobunaga’s niece, Ogo (or Oeyo), whose mother is Nobunaga’s sister Oichi, was married to Saji Kazunari, the 4th head of the Saji clan, by the order of Hideyoshi. However, when Kazunari sided with the Tokugawa and Oda allied forces later, Hideyoshi got angry and made the couple get divorced in 1584. Later in 1595, she remarried Tokugawa Hidetada, the 3rd son of Ieyasu and later the 2nd Tokugawa Shogun, and became the mother of his successor, Iemitsu.

The castle ruins site has been arranged into the park, where the two-story donjon and the castle gate were newly constructed. You can command a wonderful view of Ise Bay from the observatory deck on the donjon. The Saji clan is enshrined at Saji Shrine in the ruins site of the watch tower.

Akizuki-jou, or Akizuki Castle, was once located in Akizuki-cho, Asakura, Fukuoka Prefecture.
The origin of the castle dates back to 1203 when Harada Tanekatsu built a mountain castle in Mt. Koshouzan (856m above sea level) and his residential castle at the foot of the mountain. He changed his name to Akizuki Tanezane and the residential castle was occupied by generations of the Akizuki family.
In 1587, faced by Toyotomi Hideyoshi’s massive army surrounding the mountain castle, Akizuki Tanezane surrendered to Hideyoshi and the mountain castle was abandoned.
In 1924, Kuroda Nagaoki, who was granted the land of Akizuki, transferred the residential castle to the old mountain castle and made extensive renovations. The ruins we see today are from this castle, in which successive lords of Akizuki family of Kuroda Clan resided until Meiji Period.
The castle’s main gate, Kuromon, is still remaining and the area is known for its fall foliage.
The ruins of Akizuki Castle is a historical site dating from Kamakura Period.

Ichigoyama Castle is located at the eastern peak of Mt. Ushibuse (491 m) in Yoshii-cho, Gunma Pref. It is said that the castle was built in the late Muromachi period (1336-1573) as an attached castle of Hirai Castle, which was resided by the Uesugi clan. Located at the top of such a high peak, the castle is thought to have been used as a base to send smoke signals during the Warring States period (1493-1573). The castle fell in 1563 by the attack of Takeda Shingen. It is presumed that several outer compounds separated by dry moats were constructed but there are almost no ruins remaining now. The area was arranged into Ushibuseyama Natural Park to provide citizens with recreation and relaxation. On the castle ruin stands a three-story mock donjon with a commercial museum of Yoshii-cho on the 1st floor, a historical museum on the 2nd floor, and an observatory on the 3rd floor, from which visitors can command a 360°panoramic view.

Zakimi gusuku was a castle located in Zakimi, Yomitan-son, Okinawa Pref. It was built in the early 15th century by the renowned Ryukyu military architect Gosamaru. It was a middle-sided castle with a circumference of 365 meters and an area of 7,385 square meters. From the excavated items, the castle is thought to have been abolished in the 16th century.
During the Battle of Okinawa in the World War II, it was used as an antiaircraft artillery base by the Japanese air forces, and in the postwar period as a radar station by the U.S. forces. After the reversion of Okinawa to Japan, the preservation effort as a historic site was made. Up to the present the walls have been restored. The walls are said to be the oldest stone walls in Okinawa. The arched gate and its both sides are piled in orderly “Nuno-zumi” style (cloth piling), while the rest are piled up in “Aikata-zumi” style or Turtleback curvilinear shapes, which is typical to Okinawa.
Zakimi gusuku was designated as a National Historic Site in 1972, and was named a World Heritage Site, along with other Okinawa’s castles, in 2000.