The Space & Rocket Center offers bus tours of Marshall Space Flight Center . The tour offers views of all four National Historic Landmarks at the center including a stop at the landmark Redstone Test Stand , where Alan Shepard 's Redstone Rocket was tested prior to launch . Another scheduled stop is the Payload Operations and Integration Center , which serves as mission control for a number of experiments . Bus tours originally started July 4 , 1972 , but were suspended following the September 11 attacks in 2001 . Tours resumed July 20 , 2012 , the 43rd anniversary of the Apollo 11 moon landing , limited to United States citizens because of security protocol at the Army installation , Redstone Arsenal , which contains Marshall Space Flight Center
September 11 attacks
September 11 attacks
U.S. Space & Rocket Center