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