Regardless of all the revealing photographic documentation of the actual inner workings of the space program, of course this is the one that really caught my eye. Check out all those finer than fine specs! And that pure cyan blue, the richness of technicolor, the gasp-y faces captured...such a marvelously frozen slice of time.
But give the link a friendly click and at least peruse the photos -- we humans really can do some astoundingly terrific things. Sometimes I need reminding.