The U.S. military uses a huge floor map of Washington, D.C. to plan for presidential inaugurations, as the Tech Insider video above shows. According to this, it’s used by the Armed Forces Inaugural Committee, a joint-service organization that provides military ceremonial support. (See this U.S. Army article from 2012 about the 2013 inauguration, and this 2008 Pruned blog post about the 2009 inauguration.) [Tim Wallace]