An earlier one by Scott Wolter, somehow I must have missed it:
In 1898, a Minnesota farmer uprooted a large stone dating to 1362 covered with mysterious runes. Is it proof that the Knights Templar discovered America? Has the Holy Grail been in America all along?Holy Grail in America | 1h 27m | 2009 | TV-PG | CC
Oh, okay, the link to the Holy Grail in America points right over to the History Channel archive, which means a free trial is required to view it.
Here’s the America Unearthed episode instead:
Epic Hunt for the Holy Grail in Nova Scotia (S1, E13)
https://www.youtube.com/watch?v=Wh6PZQ4dKhI
https://www.y2mate.com/youtube/Wh6PZQ4dKhI
That second link is to one of those online converters.
http://barnesreview.org/pdf/TBR2010-no1-5-12.pdf