Running for 664 miles along Kentucky's border, the Ohio River provided a remarkable opportunity for the enslaved to escape to free soil in Indiana and Ohio. The river beckoned fugitive slave Henry Bibb onto a steamboat at Madison, Indiana, headed to Cincinnati, where he discovered the Underground Railroad. Upriver from Cincinnati, a lantern signal high on a hill from the Rankin House in Ripley, Ohio, stirred others to flee for freedom. These stories...