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ERFURT, GERMANY - FEBRUARY 08 : King Willem-Alexander of the Netherlands and Queen Maxima of the Netherlands visit the concentration camp Buchenwald during their 4 day visit to Germany on February 08, 2017 in Weimar, Germany. (Photo by Patrick van Katwijk/Getty Images)

ERFURT, GERMANY - FEBRUARY 08 : King Willem-Alexander of the Netherlands and Queen Maxima of the Netherlands visit the concentration camp Buchenwald during their 4 day visit to Germany on February 08, 2017 in Weimar, Germany. (Photo by Patrick van Katwijk/Getty Images)