Excellent, Eva and Joe! Kudos. I normally would have put this question in assassination trivia, but I thought it might be more of a challenge if I put it in a more general category. This piece of John Wilkes Booth's remains is in the Mütter Museum in Philadelphia. Years ago I wrote the museum about the piece, and I was told what was originally thought to be part of Booth's thorax is more likely to be tissue that was cleaned off the cervical vertebrae.