Ironically, our understanding of dark matter is hampered in large part by the presence of baryonic matter. The measured mass profile of pristine dark matter halos would provide clear indications of whether the dark matter is truly cold or warm or interacting. Finding such halos has, in part, motivated the search for the lowest mass galaxies because these are the most dark matter dominated systems known. I will describe a new way to find even lower mass halos than those identified so far, as well as a new class of massive galaxy that may provide massive analogs of nearly pure dark matter halos.