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It's from the book of Mormon. Moroni is supposedly the angel that once lived among the pre-Columbian civilization that Joseph Smith made up. Moroni is said to have created the golden plates that Joseph Smith translated to lead the Mormons to salvation.
Very, very cool.  Archeologists live to discover a previously unknown settlement, finding an entire civilization?  Now that's gotta feel really awesome. >

We’ve known about this civilization since at least the 1820s >

What the fuck is that link?