Today, Boston Harbor’s Long Island is a quiet place, visited mostly by seabirds. The skinny, low-lying island is home to a picturesque church, the ruins of a Cold War-era Nike missile launch site, and a cluster of vacant brick buildings once used as a municipal homeless shelter. The island’s southwestern tip points to neighboring Moon Island; in the strait separating them rise more than a dozen concrete pillars. The massive, crumbling structures are all that remains of a bridge, condemned in 2014 and demolished soon after, that once linked the…
