The road to freedom is like a treasure map hidden in a prosperous city. You may not deliberately look for it, but those historically-engraved buildings always jump into sight along the way, making people feel as if they have unearthed one treasure after another in a leisurely walk. Boston is a city full of history. Like an old man with stories, Boston talks about the history of the fierce struggle and makes people unconsciously indulge in it and forget their way home.