-- Bioluminescent Bay: A rich reservoir of marine life off Puerto Rico renowned for sea creatures that glow like underwater fireflies.
-- Sonoran Desert: One of the world's most biologically rich arid regions.
-- Gaviota Coast: The stretch of California would be only the second major seashore on the West coast.
-- Loess Hills: A tall-grass prairie in western Iowa.
-- Boyhood home of W.E.B. DuBois, founder of the NAACP.
-- Sand Creek: Colorado site where the US Cavalry in 1864 attacked a largely unarmed encampment of Arapaho and Cheyenne Indians.
-- Site in Mariana Islands where US planes took off to drop atomic bombs.
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