The following is a list of must-see historic sites in Maryland: Antietam National Battlefield Harriet Tubman Underground Railroad National Historical Park Harpers Ferry National Historical Park Fort McHenry National Monument & Historic Shrine Chesapeake & Ohio Canal National Historical Park Captain John Smith Chesapeake National Historical Trail Clara Barton National Historic Site Star-Spangled Banner National Historic Trail Monocacy National Battlefield Washington-Rochambeau Revolutionary Route National Historic Trail Frederick Douglass Museum and Cultural Center B&O Railroad Museum Benjamin Banneker Historical Park and Museum National Museum of Civil War Medicine Edgar Allan Poe House and Museum