"Cave Developer Addresses Traffic Concerns," Alan Stewart, Corydon (Indiana) Democrat, June 6, 2012, p. A3. NOTE: The information noted below was abstracted by Randi Richardson from an article that is copyright protected. Does anyone know the history of the Binkley Cave? Binkley's Cave was discovered in 1958. It is the longest in Indiana, at nearly 35 miles, and the 11th longest in the country. It is located beneath the town of Cordyon and beyond with several openings. It is anticipated that the cave will open to the public next year with a 3,500-square-foot visitor's center on Green Acres Drive.