Monuments signify areas steeped in history, and Charlestown boasts more than one. Ascend Bunker Hill Monument’s 294 steps, imagine sailing the high seas aboard “Old Ironsides,” or ask about “The Town’s” infamous mobster past, and you’ll begin to scratch the surface of Boston’s rich history. Despite its fabled altercations, Charlestown has emerged as a destination known for its dive bars serving cool attitude and historic restaurants serving hot chowder with a side of nostalgia.