Minot Ledge Light, the most romantic lighthouse in America. MINOT LEDGE refers to the notorious rock formation located about a mile off the coast of Cohasset and Scituate on which the Lighthouse was built. Minot’s Ledge Lighthouse utilized over 3,514 tons of perfectly interlocking dovetailed Quincy granite reinforced with iron shafts. Completed in 1860, this engineering marvel was the most expensive in the history of the United States. Even as waves have been known to crest over the top of the Lighthouse, the strongest gales and storms cause little more than a strong vibration inside.