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

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

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

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

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

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

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ERFURT, GERMANY - FEBRUARY 08 : King Willem-Alexander and Queen Maxima of The Netherlands attend an lunch hosted by Prime Minister Bodo Ramelow at the new library during their 4 day visit to Germany on February 08, 2017 in Erfurt, Germany. (Photo by Patrick van Katwijk/Getty Images)

ERFURT, GERMANY - FEBRUARY 08 : King Willem-Alexander and Queen Maxima of The Netherlands attend an lunch hosted by Prime Minister Bodo Ramelow at the new library during their 4 day visit to Germany on February 08, 2017 in Erfurt, Germany. (Photo by Patrick van Katwijk/Getty Images)

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ERFURT, GERMANY - FEBRUARY 08 : King Willem-Alexander and Queen Maxima of The Netherlands attend an lunch hosted by Prime Minister Bodo Ramelow at the new library during their 4 day visit to Germany on February 08, 2017 in Erfurt, Germany. (Photo by Patrick van Katwijk/Getty Images)

ERFURT, GERMANY - FEBRUARY 08 : King Willem-Alexander and Queen Maxima of The Netherlands attend an lunch hosted by Prime Minister Bodo Ramelow at the new library during their 4 day visit to Germany on February 08, 2017 in Erfurt, Germany. (Photo by Patrick van Katwijk/Getty Images)