Nido 20, Memorial site in La Cisterna, Santiago, Chile

Nido 20 is a two-storey house at Santa Teresa 037 in La Cisterna, at the paradero 20 of Gran Avenida, from which its code name comes. The FACh ran it as a clandestine detention centre, mainly in 1975, posing as the residence of a senior officer: guards stood permanently at the entrance and loud music played to drown out the screams of the tortured. It is now the Sitio de Memoria Alberto Bachelet Martínez.

The house was built in 1964 and bought in 1974 by the MIR through Solange Duhart as a safe house, used until 4 October 1974. The Air Force raided it and ran it as the clandestine detention centre Nido 20, mainly in 1975, under the Comando Conjunto with DIFA, DICAR and Patria y Libertad civilians. It was declared a historical monument on 29 December 2005.

The site is named after Brigadier General Alberto Bachelet Martínez, an Air Force officer and dictatorship victim who had worked with Salvador Allende; the name was adopted when Decree 1922 of 2005 was issued. The Comité Derechos Humanos de La Cisterna, formed in 2003–2004 around Manuel Salazar, pressed Bienes Nacionales to buy the house, which was declared a historical monument on 29 December 2005 and handed to the committee on loan for 20 years on 26 June 2022.

The house is at Santa Teresa 037, at paradero 20 of Gran Avenida in La Cisterna, the stop that gave the site its code name. On 26 June 2022 the Ministry of National Assets handed it in comodato to the Comité Derechos Humanos for 20 years, and that committee runs access today.

The house was built in 1964 and belonged to José Fernández Pérez before the MIR bought it through Solange Duhart in 1974 as a safe house. After the militants left on 4 October 1974, neighbours noticed newspapers and magazines piling up at the door, a detail that preceded the Air Force raid.