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Bryce Canyon National Park

(Encyclopedia)Bryce Canyon National Park, 35,835 acres (14,513 hectares), SW Utah; est. 1924. The Pink Cliffs of the Paunsaugunt Plateau, c.2,000 ft (610 m) high, were formed by water, frost, and wind action on alt...

Pecos National Historical Park

(Encyclopedia)Pecos National Historical Park, 6,671 acres (2,702 hectares), N New Mexico; est. as a national monument 1965, designated a national historical park 1990. The park contains the remains of the Pecos pue...

Wind Cave National Park

(Encyclopedia)Wind Cave National Park, 28,295 acres (11,459 hectares), in the Black Hills, SW S.Dak.; est. 1903. Wind Cave, discovered in 1881, was named for the strong air currents that blow alternately in and out...

Big Bend National Park

(Encyclopedia)Big Bend National Park, 801,163 acres (324,471 hectares), W Tex.; authorized 1935, est. 1944. It is a triangle formed where the Rio Grande runs southeast then northeast in a big bend along the U.S.-Me...

National Gallery of Art

(Encyclopedia)National Gallery of Art, Washington, D.C., an affiliate of the Smithsonian Institution, established by an act of Congress, 1937. Andrew W. Mellon donated funds for construction of the building as well...

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...

Valles Caldera National Preserve

(Encyclopedia)Valles Caldera National Preserve väˈyās [key], 89,766 acres (36,343 hectares), N N.Mex.; est. 2000 by Valles Caldera Trust, transferred to National Park Service 2015. Formerly part of the vast, pri...

Arlington National Cemetery

(Encyclopedia)Arlington National Cemetery, 420 acres (170 hectares), N Va., across the Potomac River from Washington, D.C.; est. 1864. More than 60,000 American war dead, as well as notables including Presidents Wi...

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...

SI, abbreviation for the International System of Units

(Encyclopedia)SI: see International System of Units. ...