This data collection show the locations of notorious crime scenes, locations related to serial killers (where they lived, where they were captured, etc), and the locations of death row prisons throughout the United States. Each placemark contains a snippet of information about the location, including photographs of the scene or criminal. Some of the information dates back 200 years.
Quick word of caution. The content is a bit dark and may not be for everyone. But these are all very well publicized cases and are of historical significance to anyone interested in criminal studies.