Book excerpt: Rosemary Ellen Guiley is a renowned expert on paranormal, visionary, and spiritual topics. She puts her expertise to use in this guide to the scariest sites in the Keystone State. Each destination includes a detailed description and photographs so readers may test their own ghosthunting skills or visit from the safety of their armchairs. Firsthand accounts of otherworldly encounters bring the spooks into view, while a Ghostly Resources section points ghosthunters to further information.