I would like to propose a category for Santa Fe Trail Sites. It could be a subcategory of Historical Places. There are many interesting sites along the Santa Fe Trail, and lots of people who travel the Trail each year. This category would be a great place to list many of the "not so well known" sites along the trail. This is one of the reasons that I and others have placed geocaches along the trail. In my county, I have six caches, but there are several other places of significance that can also be noted.
I noticed during my browsing that there is also a proposal for a category for the Migrant Trail. I'm sure there would be people interested in it, as well as many of the orther historic trails across the U.S.