Yes, you read the title correctly. This is actually Fort Knox. Just not the Fort Knox you are thinking of. It's a granite fort built between 1844 and 1869 in Maine, at the mouth of the Penobscot River.
Available in the following sizes (Rectangle B): 12x8, 18x12, 24x16, 30x20, 36x24, 45x30.
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From RECENTLY UPDATED - Eastern United States