Baikovo

 ruins, ghost town

In 1875, sovereignty over the Kuril Islands, including Shumshu, was transferred to the Empire of Japan per the Treaty of Saint Petersburg. A number of Japanese colonizing expeditions followed, establishing the settlement of Kataoka (Japanese: 片岡; on the site of the Ainu settlement of Mairuppo) as the commercial center of Shumshu. As the island closest to Russia, it became an important Japanese military outpost, as well as a center for the commercial fishing industry.

The Soviets renamed Kataoka Baikovo (Russian: Байково), and the Soviet Union annexed the island in 1946, including it in the Russian Soviet Federated Socialist Republic. Japan formally gave up sovereignty over the island under the terms of the San Francisco Peace Treaty of 1951.