As requested, a thread on Historic Launch Complex 39A (Also doubles for 39B, but images are focused on 39A).

Photo #2 Credit: (NASA/Aubrey Gemignani)
Construction of 39A started in November of 1963. I don't have exact dates for these photos but I believe they're the earliest images of 39A that I have. In the first you can see the turn to pad A in the distance, the second image shows this from a closer vantage point.
It took around 382,277m³ (500,000yd³) of surcharge to prepare the site. This would include a 24m (80ft) high pyramid, which would be known as the 'highest mountains of Brevard County' 😄
The pyramids were removed after they had settled about 1.2m (4ft).
Image dated 1964-01-14.
These images aren't dated but going off of other images I'd assume that these were taken in the second half of 1964. It took around 5,100 tons of steel to reinforce the structure of the pad.
Cellular structures were constructed either side of the flame trench. These were approx. 120m (400ft) long, 12m (40ft) wide and 12.8m (42ft) high.
Image dated 1964-10-13.
Designing the roof slabs that would sit on top of these cells would become a large engineering challenge. They had to be able to support pressures from the tracks of the transporters which would be around 4536kg (10000lbs) per square foot.
Images not dated.
It took a massive 52,000m³ (68,000yd³) of concrete to complete the main structure of the pad.
Images not dated.
39A would receive its first visitor in March of 1966. And in May of that year the Saturn 500F Test Vehicle would be transported to the pad for fit checks and testing.
The first mission to launch from 39A was Apollo 4 on 1967-11-09. As of right now, 39A has seen 116 launches.

Image taken from https://flic.kr/p/Nu6rGB  and upscaled 4x.
There is SO much more that I could dive into here. All the details on the GSE, upgrades for Shuttle and Falcon 9/Heavy. But I think this is a good place to end this one. I'm still restoring a lot of Shuttle images from the archives, so once they're done...
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