Do ghosts exist?

"Have you ever heard, seen, or felt something you couldn't explain? Some people think these occurrences have an explanation: ghosts. [Contains] historical accounts, strange photographs, freaky folklore, and creepy tales in this high-interest volume . . . learn about the mysterious sightings at Gettysburg, Edinburgh Castle, and the White House, to name just a few of the haunted locales"--Provided by publisher.