“Blondin” was the stage name for Frenchman Jean-Francois Gravelet. He was a young man who migrated to the United States with a troupe of acrobats employed by Master Showman P.T. Barnum. In 1858, the thirty-five-year-old Blondin visited Niagara Falls as a tourist and there conceived the preposterous idea of walking across it. In his mind’s eye, he saw himself walking between the two countries, the United States and Canada over the great gorge on nothing more than a rope pathway taut between the two.…