White House Cutaway Drawing, 1950
The occasion for this cutaway of the White House was its $5.4 million, 2 year-long renovation project under President Harry Truman.
By 1950, the White House was a wreck: saggy floors, weakened beams, crumbling masonry. The project gutted the entire inside of the house, replacing it with steel girders, but leaving the outside intact.
Click to Enlarge to 1300 x 748 px:
Source: Popular Science September 1950