New England Holocaust Memorial, Boston Massachusetts
There are 6. Six, to symbolize the 6 main death camps. Each tower is 54 feet high. Etched into the glass panels are numbers. Six million in total. Numbers that represent the tattooed numbers of those who died. A walkway passes underneath.
It is difficult to imagine the enormity of this from a history book or a movie, but I can tell you that it became completely incomprehensible to me as I walked this path.