WASHINGTON, DC - JUNE 01: King Willem-Alexander (2nd L) and Queen Maxima (R) of the Netherlands tours a "Global City Team Challenge" event to launch the "Global Smart City Coalition" June 1, 2015 in Washington, DC. King Willem-Alexander and Queen Maxima are visiting the United States for three days, the first time since ascending to the throne. (Photo by Win McNamee/Getty Images)
