As we leave the Mississippi River and travel up the Ohio River we meet amazing ancient structures, thousands of years old, such as a line of stone forts on top of mountains but no idea why they were built and to protect from whom.
We find a few giants, averaging seven feet tall and the remains of their burial mounds.
Weirdly enough we are finding Roman coins from around two thousand years ago and mysteriously, Judean coins from the BAr Kochba Revolt in 69 AD. 
Who was using the Ohio River to trade and explore?
And what of other strange artifacts found along it and its tributaries shores?

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