With regard to notability, all war monuments are landmarks potentially worthy of a Wikipedia article. Due to how difficult it is to source the material, I would encourage any group or individual to consider extending (or more likely creating) the article for the local town or village that created the monument, though some monuments are found at cross-roads or at scenic positions (I'm thinking of the large memorial I stopped to photograph in North Uist which only has sheep as neighbours but is still the location for a well attended annual memorial ceremony and is the opportunity to remember those more recently killed in war action).
The cross-links to information about regiments, battles and individual acts of bravery that were recognized with notable medals all add value to Wikipedia and though the information may start with a photo on Wikimedia Commons or a single document on Wikisource, I would strongly encourage volunteers to help expand the quality of Wikipedia's coverage of these areas of local interest. It strikes me as the sort of improvement that local schools might be excellent at helping with.
Cheers, Fae