I believe that they would qualify as our ancestors in the sense that we do contain their DNA in varying amounts... if we're Europeans. Sub-Saharan Africans do not... Apparently, Neanderthals were always a northern hominid and did not venture down into Africa.
I would guess the Neanderthals would have been capable of erecting some small structures, but would they have gone to the trouble of hauling and finishing large megaliths? Speculative. The sort of grandiosity that homo sapiens is famous for doesn't seem to have ever infected the other branches of our tree, but as so much is gone to time, who can really know for sure.
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