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Here's a closer view of one of the other pad, not currently occupied, Pad 39B, with its gantry clearly visible.
This is the Vehicle Assembly Building, which was built for the Apollo program. The building is over 550 feet tall, and is one of the largest buildings built by man by volume, not by height. It was intended to house the giant Saturn V rocket standing straight up. Today it is used for the Shuttle program and will be re-used for Constellation/Ares.
This giant NASA logo on the VAB required over 700 gallons of paint.