Karatsu, Saga
Due to its proximity to mainland Asia, Karatsu has long been known as a stopover to Korea and China.Under ritsuryō, the current city area was part of the Hizen Province. In 1591, on the coast of the northern part of the city (formerly the town of Chinzei), Nagoya Castle was constructed. The following year, it became the location from which the Imjin War was launched by Toyotomi Hideyoshi. In the middle of 1593, Terasawa Hirotaka created the Karatsu domain and began governing it. In 1602, replacing Nagoya Castle, Karatsu Castle was constructed in what is now the heart of Karatsu. The tower of Karatsu Castle was built in 1966 .
Akō Castle
Construction of Akō Castle took 13 years to complete the 12 gates and 10 "yagura", or towers. The castle was built on the seashore, and at the time of its construction, one could set sail from docks located in the castle. The construction was done under the surveillance of Asano Naganao, who became lord of the region in 1615. During the Meiji Restoration, Akō Castle was partly dismantled, along with many other castles. However, several buildings have since been re-constructed, following the end of the Second World War.