The NPS Boston mobile app recently debuted on iPad, iPhone, and Android, placing the experience of the Boston National Historical Park and Boston African American National Historic Site in your hands. As the Boston Herald reported on May 24th, the app creates a virtual park ranger to guide tourists from the new National Park Service visitors center through the Freedom Trail and Black Heritage Trail in the Hub, as Boston’s downtown is known. With the opening of the new visitors center, Faneuil Hall (built 1742) and adjacent Quincy Market (built 1824-26) have been marshaled once more into the service of conveying early American history, much as developer James Rouse drew upon colonial and Revolutionary American historical associations when crafting Faneuil Hall Marketplace, an upscale, locally oriented shopping experience,…