The blocks at bottom , the lighter color part where made from sand , from key west Fla , before the civil war started . The blocks at top where made from sand from the north New Jersey beach sand , all made from cement . I learned from History channel , still have doubts about that information . Any idea about this people ? Ronnie
Stone. You can see the line when the stone changed when the construction restarted.
Maybe bird poop??? I don't know.... funny question though...😂😂
Stone
Thanks! Your answer is awaiting moderation.