The lure of beachcombing in New England has been around since Colonial times. From shipwrecks, relentless storms and spooky maritime mysteries, pieces of sea glass are tumbled treasures speaking to us about our past. Many frosty cobalt blue shards come from medicine bottles from the early 20th century and can be found on beaches surrounding Boston Harbor. The seaside town of Rockport, where Hannah and the Hatchet Gang launched a destructive...