Kon-Tiki was right—South Americans sailed west—other peoples came from the east—Look at illustrations of masted sailing craft—that predate contact with Europeans—on Easter Island. Then their is the mysterious Rongo-rongo boards with their odd writing—so far untraslateable—it might as well be Martian.
Teasing clues: Indus Valley inscriptions (also not translated) on the left, Rongo Rongo on the right.