This is awesome - thanks for all of the leads so far! I've been to Livermore and Burkittsville. Lots of the others are new to me though. Did you know that the "Green Man" was a real guy? I found a pic of him online once. He was electrocuted and it burned his face off so they gave him a face mask like Richard in Boardwalk Empire. Everyone said he was a really nice guy.
I've read about a place called the Murder Swamp around New Castle where they found dismembered body parts back in the 30s. Would love to check that out some time.
I've read most of the "Weird" books. Their PA edition focuses heavily on the eastern side of the state, unfortunately. I love reading about stuff like this.