Vehicle Assembly Building

As seen from the crawlerway. The two high bays visible on this side are those primarily used for Shuttle stack operations. Ares I-X is currently being assembled in the one on the left, and Discovery was rolled out of the one on the right a day or two before this picture was taken. The high bays on the opposite side are used as a "safe haven" where a Shuttle can be parked in the event of a hurricane rollback from the pad if the other two high bays are in use, and as storage/staging for external tanks and SRB segments.