History: My Grandpa, having snuck onto the Mackinac Bridge construction site (story in comments), ~1956-1957 [2161×1746]

http://imgur.com/ShBtsqN via /r/HistoryPorn http://www.reddit.com/r/HistoryPorn/comments/49m1p3/my_grandpa_having_snuck_onto_the_mackinac_bridge/