From the Astrodome to America's first permanent English settlement, check out these national treasures before they disappear.
Gay Head Lighthouse -- One of the first lighthouses built on Martha's Vineyard, the Gay Head Lighthouse is in immediate danger of toppling over the edge of the Gay Head Cliffs in Aquinnah, Mass.
Seoul National University/Handout/Reuters
Lucy Richardson/ Reuters
iStock / gbh007
National Portrait Gallery, London
iStock / mashabuba
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