North and South Yemen have been visited several times, the images were taken between 1991 and 1998. The analogue archives contain - including images taken by another traveler in 1986 - more than 2000 slides and black & white negatives.
In addition rare historical images from the 1940s, 1950s and 1970s taken by Eva Hoeck und Erich Holm von Prosch exist, they can be found here Historical Images
For the complex situation see the (German) article https://www.bpb.de/themen/kriege-konflikte/dossier-kriege-konflikte/54611/jemen/
