La Cacha, Memory site in La Plata, Argentina

La Cacha was a clandestine detention centre in the warehouses of the former LS 11 Radio Provincia transmission plant, next to the Olmos prison between streets 191, 196, 47 and 52. Survivors' plans and later-found demolition plans describe a main building, an adjacent building used for interrogations under torture, and a caravan nearby. The buildings were demolished in June 1981 and their plans and photographs destroyed.

This location served as a detention center from 1976 to 1978 during Argentina's military dictatorship before being demolished in 1981. The period marked a dark chapter in the nation's past defined by political imprisonment.

The site functions today as a space where visitors encounter survivor testimonies and gain understanding of how this chapter shaped Argentine society. People visit to learn about the experiences of those detained and to acknowledge this period through remembrance.

The site lies next to the Olmos Penitentiary, between streets 191, 196, 47 and 52 along the Belgrano railway tracks, in the former LS 11 Radio Provincia warehouses. The buildings were demolished in June 1981, so what remains is the grounds and the layout reconstructed from survivors' plans. Access is not open for public tours; visits are tied to human rights organisations and judicial or commemorative activities.

The name came from the guards themselves, who told prisoners: "You are in La Cacha of Cachavacha, the witch who makes people disappear", referring to a cartoon character by García Ferré. The buildings were demolished in June 1981 and their plans and photographs destroyed to erase all trace; only drawings by survivors existed until April 2010, when plans from the time of demolition were found and matched their reconstruction.