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Castle Mountains National Monument

(Encyclopedia)Castle Mountains National Monument, 20,920 acres (8,466 hectares), SE California. Surrounded on three sides by the Mojave National Preserve (see Mojave Desert), the monument contains Native American a...

Nahanni National Park Reserve

(Encyclopedia)Nahanni National Park Reserve nəhănˈē [key], c.1,840 sq mi (4,766 sq km), Northwest Territories, Canada, W of Fort Simpson; est. 1972. Located just E of the Yukon border, the park extends along th...

Aztec Ruins National Monument

(Encyclopedia)Aztec Ruins National Monument, 318 acres (129 hectares), NW N.Mex., near Farmington; est. 1923. Ruins of a 12th-century Pueblo town contain interesting kivas, one of which has been completely restored...

Waterton Lakes National Park

(Encyclopedia)Waterton Lakes National Park, 203 sq mi (525 sq km), SW Alta., Canada, SW of Lethbridge and at the U.S. border, adjoining Glacier National Park, Mont.; est. 1895. It is the Canadian section of Waterto...

Chimney Rock National Monument

(Encyclopedia)Chimney Rock National Monument, 4,726 acres (1,913 hectares), SW Colorado; est. 2012. Located in San Juan National Forest, it is bordered by the Southern Ute reservation. Within the monument are the r...

Mount Revelstoke National Park

(Encyclopedia)Mount Revelstoke National Park rĕvˈəlstōkˌ [key], 100 sq mi (259 sq km) SE British Columbia, Canada, in the Selkirk Mts., just E of the Columbia River valley; est. 1914. Situated on a high platea...

Mount Rushmore National Memorial

(Encyclopedia)Mount Rushmore National Memorial, 1,278 acres (518 hectares), SW S.Dak., in the Black Hills; est. 1925, dedicated 1927. There, carved on the face of the mountain and visible for 60 mi (97 km), are the...

Lewis and Clark expedition

(Encyclopedia)Lewis and Clark expedition, 1803–6, U.S. expedition that explored the territory of the Louisiana Purchase and the country beyond as far as the Pacific Ocean. The men were gathered and in the winte...

Bears Ears National Monument

(Encyclopedia)Bears Ears National Monument, 201,876 acres (81,696 hectares), SE Utah; est. 2016. Named for prominent twin buttes, the national monument as proclaimed by President Obama was more than six times large...

Crater Lake National Park

(Encyclopedia)Crater Lake National Park, 183,224 acres (74,206 hectares), SW Oreg., in the Cascade Range; est. 1902. Crater Lake, 20 sq mi (52 sq km), lies in a huge pit that was created when the top of a prehistor...