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alternatehistory.com
Long story short, there is a conspiracy theory/legend that the Zeno brothers of Venice (go, go figure) were hired by the Scottish Templar knight, Henry Sinclar, to sail to the west of Europe, and subsequently discovered America. For the Wikipedia spin of the story read it here.
Anyways, what if the Templars really did discover America? Could they have created a small colony in the New World for whatever nefarious esoteric Templar purposes? What if the Venetian brothers weren't bumped off? Would they have told their city-state, or would they have tried to create a secret Transatlantic trade for the Templar colony? Would this colony have ended up breaking down and its inhabitants intermarrying with the Amerindians?
Basically, I'm trying to create this new category. "Secret History" takes a bit of historical legend and tries to either a) turn it into an AH where something could have happened outside of "known" history, or b) takes the legend and blows it into a full-scale AH, with the Templars colonizing North America, and whatnot.