3. Blennerhassett Island
Blennerhassett is on – or rather in – the Ohio River, and it was an Indian settlement. The history here is just amazing, not just in terms of the settlement but also in terms of the dirty dealing that went on there. For example, while it was once called Backus Island, its name now is derived from Harman Blennerhassett, who played a part in the treason conspiracy spearheaded by Aaron Burr. You can even visit the house where the plot took place.