The phrase "cobwebs of antiquity" conjures up an image of dusty, neglected relics from a bygone era. When seeking synonyms for this phrase, one might consider "antiquated remnants" or "obsolete artifacts." Another possible option is "archaic debris," which suggests a sense of cluttered accumulation over time. "Ancient relics" and "outdated remnants" also convey the idea of remnants from a past era that may no longer serve a useful purpose. Whatever words one chooses, they should evoke a sense of decay, dust, and the passage of time, all captured by the original phrase "cobwebs of antiquity".