The author doesn't claim ancient greeks did it (though one of his sources does.) Stone softening is an interesting idea and a heck of a lot less crazy than "aliens did it."

I am from Greece. Unfortunately, I can't find anything in english but I have read quite a few "theories" about ancient Greeks traveling to America.

And I am from Scotland and I've heard all manner of "theories" about the Scots being a lost tribe of Israel and that the Lia Fàil (the Stone of Destiny) is the stone used by the biblical Jacob as a pillow.

Just because something is a nice story doesn't mean it is true!

Isn't there a famous church in Scotland that has carved stone reliefs of Corn/Maize, except they were carved many years before the New World, and corn, were officially known about in the Old World.

I think ancient people did travel, after all, we have learnt they had number systems, watched the constellations, had crude but reasonable ancient maps, and genetics are discovering things all the time about the hereditary lines.

That would be Rosslyn Chapel - which has such a stunningly high level of detail in the stone carvings (NB well worth seeing) that it's not surprising that parts of it look a bit like something else. It wouldn't surprise me if parts of Rosslyn Chapel look a bit like Lady Gaga or an Xbox controller....

http://en.wikipedia.org/wiki/Rosslyn_Chapel

Rosslyn Chapel is also famous for apparently housing the Ark of the Covenant and/or the Holy Grail... :-)

You can rent and stay in Rosslyn Castle, very close to the chapel. I stayed there once, and it was one of the neatest places I've been. The only shower is on the way to the dungeon.

http://www.landmarktrust.org.uk/search-and-book/properties/r...

So, I did a quick image search for Rosslyn Chapel maize and corn (see sibling comment), and I found nothing that looked convincingly like corn to me. There were a few things that looked a little like corn, but I would interpret them as other plants and/or bread.

They pretty clearly look like sheaves of wheat to me, to the extent that it wouldn't have occurred to me they might be something else.

I never said the stories were true, exclamation mark. I only noted the fact that such theories exist in Greece as well.

Where does he claim that?

Look at his sources. This is where he is drawing evidence for his claims. This is why it is important for people with credentials to vouch for each other. It is a web of trust. One can sound reasonable while spouting lunacy if the broader population doesn't have the specific knowledge to assess their claims.