Visitors to NASA's Kennedy Space Center can now see inside the colossal Vehicle Assembly Building, off-limits throughout the 30-year shuttle program. The cost is an extra $25 for adults and $19 for children -- plus the usual admission charge. The 525-foot-tall VAB was built to hold the Saturn V rocket that sent men to the moon in the late '60s. It's where every space shuttle was attached to its external fuel tank and booster rockets. NASA officials stress the VAB tour is temporary -- it will cease when the VAB is used again to stack rockets for launch.