How hard is it to visit?
The civil war doesn't really seem to be a problem in Shibam iteself, (part of Hadhramaut, in the middle of the country, well in "red" territory in this map: https://en.wikipedia.org/wiki/Yemeni_Civil_War_(2015%E2%80%9...
Your biggest problem would probably be getting into Yemen itself. You'd need to get to the port of Mukalla and go overland from there.