On seven full pages the paper today showed pictures of Himmler and his family smiling into the camera during a fishing trip, the top Nazi taking a bath in a lake or feeding a little fawn.
The newspaper, which says the material is contained in an eight-part series it plans to publish, also quotes excerpts from Himmler's love letters addressing his wife as "my sweet, beloved little woman."
Welt said it worked together with Israeli film director Vanessa Lapa, whose family had the documents in its possession.