Spectacle Island

What Seaglassmap found here

Take nothing. The park names sea glass in its own rules: visitors are asked to leave behind any natural or cultural resources they find, including, but not limited to, sea glass, seashells and ceramics. The beaches here are thick with it. This was Boston's dump for decades, capped and landscaped into an island park, and pale green Depression glass comes up alongside willow-pattern china and cup handles. Some of it is barely frosted: a sheltered harbour does not tumble like an ocean coast. Ticketed ferry, May to October. Come to look.