Oro Island

Finland

Örö is a fortified island off the southwestern tip of Finland, in the Archipelago Sea. A closed Russian and Finnish military island for a century, it opened to visitors in 2015 as part of the national park. Attractions include the coastal artillery batteries and barracks of the fortress island, the rare scorched heathland habitat, the beaches, the naval history exhibitions, and the wild edge of the world's largest archipelago.