"Find the Keystone...Q"--->Keystone Found: On Little St. James
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This is not my work...all kudos go to T.N.Homesteader for his decode.
The"Keystone"...Is the sacrificial temple on J. Epstein's Little St. James Island, and is located underground---->beneath the heliport.
Older Google maps verify its location.
It has since been covered over as to be hidden.
As of 2006, can be clearly seen.
(pics relevant...and will daisy chain his video of decode next post. Start vid @24:35.)