People pass a model of an American Civil Warera observation balloon during a demonstration on the National Mall June 11 2011 in Washington DC...
{"Image ImageDescription": "WASHINGTON - JUNE 11:  People pass a model of an American Civil War-era observation balloon during a demonstration on the National Mall June 11, 2011 in Washington, DC.  Re-enactors, Smithsonian staff and volunteers demonstrated an American Civil War-era balloon near where in 1861 Professor Thaddeus Lowe showed the technology to o President Lincoln as a potential tool for spying on Confederates.  (Photo by Brendan Smialowski/Getty Images)", "Image Copyright": "2011 Getty Images"}