Sarushima Island: Tokyo Bay's Uninhabited Fortress

Sarushima Island, a short 10-minute ferry ride from Yokosuka, is a unique destination that blends natural beauty with a rich military history. As the only natural uninhabited island in Tokyo Bay, Sarushima, also known as Monkey Island, offers visitors a chance to explore a landscape where nature has reclaimed the remnants of former fortifications. The island's history dates back to the Kamakura period (1185-1333), with a legend that a white monkey guided the monk Nichiren to safety on the island during a storm. In the Edo period (1603-1867), the island was fortified to protect Tokyo Bay from foreign ships. During the Meiji era (1868-1912), it was further developed as a defensive base, with the construction of brick barracks, ammunition depots, and tunnels. These structures, built using a rare French-style bricklaying technique, remain a popular attraction. Sarushima played a role in World War II, serving as a site for anti-aircraft batteries. After the war, the island was occupied by the U.S. military before being returned to Japan in 1961. In 1995, Yokosuka City developed Sarushima Park, opening the island to the public. Today, visitors can explore the island's historical sites, including the "Tunnel of Love," gun battery sites, and the remains of the electric power plant. The island also offers opportunities for recreation, such as barbecuing, fishing, and strolling along the beach. The island is said to have a similar atmosphere to the Ghibli film, Castle in the Sky, with ruins overtaken by nature. Note that overnight stays are prohibited, and drones, BBQ stoves, fireworks and pets are not allowed.