Hermit, thanks for your input. I just finished reading a book called SECRETS OF THE WIDOW'S SON by David A Shugarts whose entire volume was dedicated to what may constitute Brown's next novel.

I -like you- consider Dan Brown to be just more pop culture, but his are texts liberally sprinkled with truth, hence his wide following. Not unlike many prophetic threads here, yes?!

In SECRETS..., the author explores Washington, D.C. place-by-place [including your CIA Kryptos Puzzle], naming specific Freemasonry connections. He did NOT explore the Pentagon, hence my personal search.

This new wrinkle that "Jackinthebox" has supplied above only deepens my mysteries even more.... I don't need Dan Brown, I have GLP!!! And, that's a powerful resource!!

BTW: I picked up the "SECRETS..." book for only a buck at a DollarTree store; it doesn't have much entertainment substance, but it has ALOT of reference material.