You will not find this listed in any of the guidebooks for some reason. It needs to be included. We happened to find out about it because of a co-worker of my partner who is a landscape architect. She had come across an article in one of her professional journals about this park. It takes a little finesse to get there if you do not have a car, but it is not difficult to do and it is worth it.
You must take a train from Belgrano Station (between the Retiro Station and the Omnibus Station) towards Via Rosa to the Scalabrini Ortiz station, which is just the second stop on the line. It is right next to the University of Buenos Aires. The cost was something like 3 pesos round trip for both of us. From there it is a short walk to the memorial park; just follow the students and then walk past the entrance to the University. It is a completely safe place to go to and visit.
The park is a memorial to the victims of the military junta from 1976-1983-also known as the Dirty War. It is an open air memorial park that contains sculptures that were selected from an international competion, a central visitor center building that had a wonderful contemporary photograhy exhibit and a memorial wall that contains the names and ages of over 9,000 victims who disappeared during this time. The names memorial is arranged so that it slashes through the earth berm to represent the violence that surrounded this sad chapter in Argentine (ane world) history. The memorial is beautifully sited next to the Rio Plata because that is where most of the victims were "buried." Some of the water features were not working at the time that we visited, but we suspect that was because of the onset of winter. I am hoping that it is not because the present government is forgetting about it.
Even though I am not Argentinian or of Argentine descent, this was a very emotional experience. When you look at these walls, the thousands of names and their ages (mostly 20s and 30s) it is sobering. Mankind's inhumanity to mankind continues even though we said "Never again!" I wept. The other times where I have had a similar reaction is in viewing the Vietnam Memorial in Washington DC, the Japanese American Internment Memorial (also in Washington), and the Holocaust Memorial behind Notre Dame in Paris. The park is a perfect place to escape the hustle and bustle of BA as well as a place to reflect. Sometimes vacations need to have a little reflection time to remind us how fortunate we are to live where we live.
I sincerely hope that you will make an attempt to get to this memorial park. For us, it was worth the effort.