Devils Tower National Monument

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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French Île du Diable

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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