The phrase "remote pasts" can be substituted with a variety of synonyms that connote a similar sense of time and distance. Some options include "distant history," "ancient times," "bygone eras," "time immemorial," "antiquity," and "prehistoric times." Each of these phrases carries a slightly different connotation, with some emphasizing the idea of time passing, while others highlight the sense of history or lineage. Depending on the context, different synonyms for "remote pasts" may be more appropriate or impactful. However, all of these options capture the essence of a time long gone, conveying a sense of distance and disconnect between the past and present.