Visitors walk among the planes on the main floor and along two skywalks positioned at different heights to allow 'nose-to-nose' views of the planes. There are flight simulators that give you a good dose of reality, an IMAX theater and a 164-foot observation tower. According to the Smithsonian, the Center has ten sections and 'displays more than 150 aircraft and 148 space artifacts that include helicopters, ultra-lights, and experimental flying machines.' The Civilian Section displays the 202-foot-long Air France Concorde the Space Section showcases the Space Shuttle Enterprise and the World War II Section is dominated by the B-29 Enola Gay, the airplane that dropped the atomic bomb on Hiroshima, Japan.Among the thousands of artifacts: the Charles Lindbergh 'Lucky Lindy' memorabilia, the 69-foot, floor-to-ceiling Redstone missile, and a POW exhibit that contains items from prisoners held captive during the Vietnam War. Ten stories high and three football fields long, it houses the largest of the Smithsonian's aircraft collection next door to Dulles Airport in Chantilly, Virginia, a short shuttle ride from the National Mall in D.C. took me to the Smithsonian's latest achievement - a second air and space museum. The Enola Gay carried the weapon, nicknamed 'Little Boy.' It weighed nearly 10,000 pounds and could produce an explosive force equal to an estimated 15,000 to 20,000 tons of TNT.