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Natural Bridges National Monument

(Encyclopedia)Natural Bridges National Monument, 7,636 acres (3,093 hectares), SE Utah; est. 1908. Located in an area of colored cliffs and box canyons, the monument contains three huge natural sandstone bridges: O...

Waco Mammoth National Monument

(Encyclopedia)Waco Mammoth National Monument: see National Parks and Monuments (table)national parks and monuments (table). ...

Walnut Canyon National Monument

(Encyclopedia)Walnut Canyon National Monument: see National Parks and Monuments (table)national parks and monuments (table). ...

Carrizo Plain National Monument

(Encyclopedia)Carrizo Plain National Monument: see National Parks and Monuments (table)national parks and monuments (table). ...

Cascade-Siskiyou National Monument

(Encyclopedia)Cascade-Siskiyou National Monument: see National Parks and Monuments (table)national parks and monuments (table). ...

Castle Clinton National Monument

(Encyclopedia)Castle Clinton National Monument: see Battery, the. ...

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...

Sonoran Desert National Monument

(Encyclopedia)Sonoran Desert National Monument: see National Parks and Monuments (table)national parks and monuments (table). ...

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...

California Coastal National Monument

(Encyclopedia)California Coastal National Monument: see National Parks and Monuments (table)national parks and monuments (table). ...