This is the building within which they attach the shuttle - vertically!!! - to the booster rockets and the main fuel tank. The crane that does it is apparently accurate to within a few 1000ths of an inch!
Here is the 'crawler'. It weights something like 18,000 imperial tons when it is loaded. It crawls on a bed of fresh pea-gravel over to the launch pad (below) at a very fuel efficient 45 feet/gallon...yoikes! After it has crawled over the gravel, the gravel is pulverized into a fine dust.
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