Stumbled onto this blog about odd and interesting places in PA. Seems like a great list for adventure type riders. Especially since he generally doesn't give simple and clear directions to them, you have to ferret most of them out yourself. http://thepennsylvaniarambler.blogspot.com/
Good find. Read the blog about Dorcie Calhoun. I worked in the gas patch in the late 70's and my first boss the "Evening Tour Driller" was an older gent named George Reynolds who loved telling stories about a guy he worked for in Renovo named Dorcie Calhoun.