A short walk from the Peabody Essex Museum and Witch City Mall on busy Essex Street, you can find Salem’s solemn memorial to the 20 victims of their 1692 witch trials. Granite walls surround three sides of the space; the fourth side is an open stone threshold and a blue plaque on one corner. The Salem Witch Trials Memorial was dedicated in 1992, three centuries after the infamous witch trials took place. Within the walls, there are simple stone slabs, one for each victim, etched with their name, execution date, and…