National parks, according to The ParksBase, include everything from the National Park Service parks areas, including national historic areas, national seashores, national lakeshores, national military parks, national monuments, and more, to US Forest Service sites, including national forests, national monuments, national historic sites, and more, to Bureau of Land Management lands, National Wildlife Refuges, US Army Corps of Engineers sites, and more.
National parks are spots for recreation, historical studies, natural studies, cultural studies, and other educational opportunities. They are spots that are important to our natural, historical, and cultural heritage, and they have a lot to teach us.
This is a list of national parks in Pennsylvania. As I add them to my visited list I will add links.
Northwest Pennsylvania

National Forests
Allegheny National Forest
National Wildlife Refuges
Erie National Wildlife Refuge
United States Army Corps of Engineers Sites
Allegheny Reservoir Recreation Area | Shenango River Lake Recreation Area | Union City Dam Recreation Area | Woodcock Creek Lake Recreation Area
North Central Pennsylvania

National Forests
Allegheny National Forest
United States Army Corps of Engineers Sites
Cowanesque Lake Recreation Area | East Branch Clarion River Lake Recreation Area | Tioga-Hammond Lakes Recreation Area
Northeast Pennsylvania

National Park Service Parks
Delaware Water Gap National Recreation Area | Steamtown National Historic Site
National Wildlife Refuges
Cherry Valley National Wildlife Refuge
United States Army Corps of Engineers Sites
Aylesworth Creek Lake Recreation Area | Beltzville Lake Recreation Area | Francis E. Walter Dam Recreation Area | Prompton Lake Recreation Area
West Central Pennsylvania

National Park Service Parks
Johnstown Flood National Memorial
United States Army Corps of Engineers Sites
Conemaugh River Lake Recreation Area | Crooked Creek Lake Recreation Area | Curwensville Lake Recreation Area | Mahoning Creek Lake Recreation Area
Central Pennsylvania

National Park Service Parks
Allegheny Portage Railroad National Historic Site
United States Army Corps of Engineers Sites
Foster Joseph Sayers Dam Recreation Area | Kettle Creek Lake Recreation Area
East Central Pennsylvania

National Park Service Parks
Hopewell Furnace National Historic Site
United States Army Corps of Engineers Sites
Blue Marsh Lake Recreation Area
Southwest Pennsylvania

National Park Service Parks
Fort Necessity National Battlefield | Friendship Hill National Historic Site
United States Army Corps of Engineers Sites
Conemaugh River Lake Recreation Area | Loyalhanna Lake Recreation Area | Monongahela River – Maxwell Pool Recreation Area | Youghiogheny River Lake Recreation Area
South Central Pennsylvania

National Park Service Parks
Eisenhower National Historic Site | Flight 93 National Memorial | Gettysburg National Military Park
United States Army Corps of Engineers Sites
Youghiogheny River Lake Recreation Area
Southeast Pennsylvania

National Park Service Parks
Edgar Allen Poe National Historic Site | First State National Historical Park | Hopewell Furnace National Historic Site | Independence National Historical Park | Thaddeus Kosciuszko National Memorial
National Wildlife Refuges
John Heinz National Wildlife Refuge at Tincum
