Atlas Obscura is one of the largest, most well-known and most impeccably awesome archives of amazing places, foods and experiences in the world.
Here is their list of places to see in the Keystone State! From the cave where America's first doomsday cult awaited the end of the world, to a field of mysteriously sonorous rocks that produce musical notes when struck, to one of the oldest continuously occupied streets in the U.S.A., to the United States' oldest funicular which is also one of the steepest, Pennsylvania is a treasure chest of cool places! How many of these awesome spots have you been to?
Note: Some of these you cannot visit or see anymore, which have been marked with (Permanently Closed). So therefore, if you haven't already seen them, I don't know if you'll ever be able to completely finish this list.
Note 2: This is as of February 21, 2024. Sorry future people, there will definitely be more that can't be added.