Genocide Tourism
There is a very traditional view of conserving historic sites that considers such sites to be honorific and edifying; noble and good. The Mount Vernon Ladies Association of the Union saved Mount Vernon to honor George Washington as the founder of the United States. Of course, they were also trying to protect his home from the depredations of “manufactories” and prevent the Civil War, but their primary stated goal was honorific.
Similarly, much of 19th century American preservation was about battlefields and founding fathers. But historic sites are also saved as warnings to posterity; as legacies or reminders of very horrible events that are the opposite of honorific: we save them because there are lessons to be learned. The Germans have a word for this kind of landmark: Mahnmal, as opposed to the more generic Denkmal or the honorific Ehrenmal. And it was in Germany 30 years ago that I first encountered genocide tourism.