Carried atop an orbiter transporter, the Space Shuttle orbiter Atlantis rolls out of Orbiter Processing Facility (OPF) Bay 3, in background, enroute to the Vehicle Assembly Building (VAB). This photo was taken from the roof of the VAB. The rollover of the orbiter is one of the prelaunch milestones. 
Atlantis is being readied for the next mission, STS-86, which is targeted for a September launch. STS-86 will be the seventh of nine planned dockings of the Space Shuttle orbiter with the Russian Space Station Mir.
NASA
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