Description: A daily photo highlight from Smithsonian collections. [caption id="" align="aligncenter" width="382" caption="Samuel P. Langley, 1834-1906, third Secretary of the Smithsonian Institution (1887-1906), observing birds in flight from the roof of the Arts and Industries Building, c. 1901-02, by Unknown photographer, Photographic print, Smithsonian Institution Archives, Record Unit