Day-Tripping through Time: National Park History in Maryland and Pennsylvania

Inspired by the upcoming NPS centennial, which President Obama discussed in his most recent weekly address, I have spent parts of this summer posting about my visits to mid-western memorials, parks, and sites run by the NPS from central Ohio to eastern Missouri through a blog I named the National Park History Tour. Of course, one need not travel outside the Mid-Atlantic to learn about the past from the NPS, in fact one can cover over a century of American history in a weekend in Maryland and Pennsylvania.