The memorial at Tiergartenstraße 4 (Photo: 2017)
Aktion T4 was the Nazi euthanasia programme that resulted in the murder of over 200,000 people with learning and physical disabilities. The offices were based in a villa, now demolished, at Tiergartenstraße 4 in Berlin.
Follow these links for more information:
Play by Stephen Unwin All Our Children
Films on YouTube
Holocaust Memorial Day Trust: