Maiko Battery

The Akashi Domain Maiko Battery was a Bakumatsu period coastal artillery battery erected by Akashi Domain on the Seto Inland Sea coast of what is now Tarumi-ku, Kobe, Hyōgo Prefecture in the Kansai region of Japan. The ruins were designated a National Historic Site in 2007. It is also called the Maiko Hōdai-ato after its location on Kaji Bay.

Source: Wikipedia