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WASHINGTON, DC - JUNE 01: Queen Maxima 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)

WASHINGTON, DC - JUNE 01:  Queen Maxima 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)