Luxembourg's Grand Duke Jean made a rare public appearance last week when he visited The Family of Man exhibition at the “Château de Clervaux”.
The iconic collection of works, which was put together by Luxembourg photographer Edward Steichen, has been included in UNESCO's memory of the world register since 2003.
Grand Duke Jean, 93, toured the collection on Friday accompanied by Princess Margaretha of Liechtenstein.
Princess Margaretha is the fourth child and second daughter of Grand Duke Jean of Luxembourg and Princess Joséphine Charlotte of Belgium.
It was his first visit following the renovation and restoration of the exhibition, which reopened in July 2013.
Edward Jean Steichen was an American photographer, painter, and art gallery and museum curator, who was born in Luxembourg.
His Family of Man photography exhibition, including 503 photos from 68 countries by 273 photographers, chart the spectrum of the human experience through birth, love, joy, war, privation, illness and death.
It was first shown in 1955 at the Museum of Modern Art in New York and was gifted to Luxembourg in the 1970s. It has been hosted at the castle since 1994 where it closed for three years for renovations from 2010.