Brandenburg Euthanasia Centre
The Brandenburg Euthanasia Centre (German: NS-Tötungsanstalt Brandenburg), officially known as the Brandenburg an der Havel State Welfare Institute (Landes-Pflegeanstalt Brandenburg a. H.), was a killing centre established in 1939 as part of the Nazi euthanasia programme, known after the war as "Aktion T4".
Source: Wikipedia — Brandenburg Euthanasia Centre (CC BY-SA 4.0)