I remember reading in the Kolbrin Bible an account by Phoenicians and Greeks of having settled in a land full of swamps and thick forest, and the problems they had with the "local barbarians".  Eventually the problems got to be so severe that they determined to repair their ships and leave, sailing for a long time, and then landing in modern day Britain.  I had a hard time initially with the account because I couldn't figure out what part of Europe would have been so swampy and hot and thickly forested as they describe, but then South America would be a perfect fit.

There are other Phoenician landings in South America cited by Robert Baird in his "Diverse Druids", along with a claim that Egyptian mummies have been found with traces of cocaine in their system.