On March 17, 1953, the United States conducted the atomic test Annie, the first detonation under Operation Upshot-Knothole. But the 16-kiloton bomb was accompanied by a civil defense study called Doorstep, designed to evaluate the effects of a nuclear impact on two wooden houses, fifty cars, eight shelters, and many mannequins. The images you'll see below show the "residents" before and after the explosion.
Another interesting detail about Annie is that its detonation was broadcast live on national television—since it was a "very important event for every American family"—and filmed with kinescope. Both houses behaved as expected under Annie's fury, and you've likely seen part of the footage recycled in other shorts. The official booklet highlights that some cars and the post office truck could be driven even after the detonation. You can read the booklet on the Internet Archive.
You can also watch a video about Operation Doorstep on the Internet Archive.
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