PHOTOS: 11 Most Endangered Historic Sites in U.S. Named

PHOTOS: 11 Most Endangered Historic Sites in U.S. Named
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Unity Temple, Oak Park, Illinois

Frank Lloyd Wright built Unity Temple for his own Unitarian congregation in the early 1900s.

The flat-roofed structure is one of the earliest public buildings to feature exposed concrete, a design element characteristic of Wright.

Years of water infiltration have put the landmark at risk, making it one of the National Trust for Historic Preservation's 11 most endangered U.S. historic places for 2009.
—Photograph courtesy National Trust for Historic Preservation
 
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