National preserve, northeastern Wyoming, U.S. The first U.S. national monument, it was established in 1906 near the Belle Fourche River. It includes 1,347 acres (545 hectares) and features a natural rock tower, the remnant of a volcanic intrusion now exposed by erosion. The tower has a flat top and is 865 ft (264 m) high.
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Rocky islet off the Atlantic coast of French Guiana. The smallest of the three Îles du Salut, it is a narrow strip of land 3,900 ft (1,200 m) long and 1,320 ft (400 m) wide. Part of a penal settlement since 1852, it housed the convicts' leper colony until the islands were made a maximum-security area. It shared the notoriety for cruelty of the mainland French Guiana penal colony. Spies and political prisoners, including Alfred Dreyfus, were held there. The island's use as a penal colony was phased out by the early 1950s.
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Devils may refer to