1) The Complete Works of Aristarchos of Samos.
2) Sufficient evidence to settle, for once and for all, the "midsummer or midwinter" controversy of Stonehenge.
3) Sufficient evidence (etc.) to establish the intent of the creators of the Uffington White Horse, the Long Man of Wilmington, and Carnac.
4) The Memoirs of Eratosthenes.
5) The original formula for "Greek Fire".
6) A casket of tamarind wood containing a mummified "member".
7) Annotated plans (in a script we can read!) for Great Zimbabwe and Khami.
8) Sufficient evidence (etc.) to establish the provenance of the Voynich Manuscript and, if it is not a hoax, the key to its translation.
9) Sufficient evidence (etc.) to establish the provenance of the Cerne Abbas Giant.
10) Unequivocal evidence for the site of the Battle of Camlann (if it occurred).
--
Stephen