Until late in the eighteenth century, books aimed at kids were primarily designed to be educational or morally uplifting. Then, in 1770, a London publisher named Robert Sayer introduced what were called ‘metamorphoses’ books because they contained pages with illustrations that could be revealed by raising a flap. Later on, publishers like Ernest Nister and Dean & Son put out books with movable pictures. When a tab was pulled, the picture the child was looking at could be transformed into another picture. And publisher Raphael Tuck’s ‘Mechanical’ series had books with three-dimensional stand-up objects, the pre-cursers of the pop-up books published by S. Louis Giraud in 1929.
As a child I had a book that, when opened, displayed a model of Tower Bridge that actually worked. What the book itself was about, I have no idea (presumably something to do with London and/or the Tower), but the pop-up bridge I remember.