King Willem-Alexander of the Netherlands (r) and Queen Maxima laugh on the roof terrace of the Reichstag building of the German Bundestag.

King Willem-Alexander of the Netherlands and Queen Máxima are received at the military section of Berlin Brandenburg Airport (BER).

King Willem-Alexander of the Netherlands and Queen Máxima are received at the military section of Berlin Brandenburg Airport (BER).

Federal President Frank-Walter Steinmeier (r) welcomes King Willem-Alexander of the Netherlands and Queen Máxima in front of Bellevue Palace.

King Willem-Alexander of the Netherlands and Queen Máxima wave during the welcome in front of Bellevue Palace.

Federal President Frank-Walter Steinmeier (2nd from right) and his wife Elke Büdenbender (r) welcome King Willem-Alexander of the Netherlands and Queen Máxima at Bellevue Palace.

Federal President Frank-Walter Steinmeier (l) welcomes King Willem-Alexander of the Netherlands with military honours in the park of Bellevue Palace.

Queen Maxima laughs at the Dutch Embassy. She came to sign a memorandum by the Prinses Máxima Centrum in Utrecht and the Hopp Children's Tumour Centre Heidelberg (KiTZ). The partners want to create better framework conditions for European paediatric oncology.

King Willem-Alexander of the Netherlands (front centre) walks with German President Frank-Walter Steinmeier (r) and Veronika Nahm, Director of the Anne Frank Zentrum, to the Centre's exhibition.

King Willem-Alexander of the Netherlands and Queen Máxima laying a wreath at the Neue Wache, the Federal Republic of Germany's central memorial to the victims of wars and tyranny.

King Willem-Alexander of the Netherlands and Queen Máxima laying a wreath at the Neue Wache, the Federal Republic of Germany's central memorial to the victims of wars and tyranny.

König Willem-Alexander der Niederlande und Königin Maxima gehen zusammen mit Michael Müller (SPD), Regierender Bürgermeister von Berlin, über den Pariser Platz vor dem Brandenburger Tor.

King Willem-Alexander of the Netherlands (r) and Queen Maxima arrive with Governing Mayor Michael Müller from the Rotes Rathaus.

King Willem-Alexander of the Netherlands and Queen Maxima walk together with Michael Müller (SPD), Governing Mayor of Berlin, and his daughter Nina (r) through the Brandenburg Gate to Pariser Platz.

Queen Maxima of the Netherlands signs the guest book during a visit to the Robert Koch Institute.

Federal President Frank-Walter Steinmeier (r) welcomes King Willem-Alexander of the Netherlands and Queen Maxima outside Bellevue Palace for a state banquet in honour of the Dutch royal couple. Elke Büdenbender, wife of Federal President Steinmeier, waits at the door due to a broken metatarsal. Queen Maxima of the Netherlands signs the guest book during a visit to the Robert Koch Institute.

King Willem-Alexander of the Netherlands (l) and Queen Maxima stand in the dome of the Reichstag building in the German Bundestag.

King Willem-Alexander (l) of the Netherlands and Queen Maxima (m) visit the Herzberge Landscape Park. Next to them is Dirk Behrendt (Bündnis90/Die Grünen), Senator of Justice of Berlin.

King Willem-Alexander of the Netherlands and Queen Maxima visit the Humboldt Forum together with Michael Müller (SPD,l), Governing Mayor of Berlin, and Helmut Dorgerloh (r), General Director of the Humboldt Forum.

Queen Maxima of the Netherlands looks at a gift from scientists during a visit to the Technical University of Berlin (TU): A magnifying glass with a built-in microchip showing a picture of her and her husband. The royal couple is learning about key technologies from photonics and quantum research at the TU.

King Willem-Alexander (3rd from right) of the Netherlands and Queen Maxima (r) visit the Herzberge Landscape Park and talk to children.

King Willem-Alexander of the Netherlands (2nd from left) and Queen Maxima (l), together with Michael Müller (3rd from left, SPD), Governing Mayor of Berlin, are guided through the exhibition "Berlin Global" at the Humboldt Forum in the Berlin Palace by Paul Spies (r), Director of the Stiftung Stadtmuseum Berlin.

King Willem-Alexander of the Netherlands and Queen Maxima walk through the former entrance door of the former techno club "Tresor" during a tour of the exhibition "Berlin Global" at the Humboldt Forum in the Berlin Palace.