 In 1960, the "Stapferhaus Lenzburg" cultural foundation was established and moved into the "Hintere Haus".Between 1978 and 1986, the castle was once more thoroughly renovated, and a French-style garden established in the southwest section.In 1987, the canton transferred its comprehensive cultural history collections to the castle and opened the "Historisches Museum Aargau" (Historical Museum of the Aargau), which in 2007 became the "Museum Aargau" (Aargau Museum).