Mission Control Center at NASA's Johnson Space Center directed every crewed American spaceflight from Gemini IV in 1965 through the final Space Shuttle landing in 2011. The original Flight Control Room, now designated a National Historic Landmark, remains exactly as flight directors left it after Apollo 17 returned from the Moon in December 1972—consoles frozen mid-mission, cigarette-scarred desktops, rotary telephones still cabled to their stations. A second control room oversaw Shuttle operations for three decades, its flat-panel displays and ergonomic chairs a sharp contrast to the Apollo room's utilitarian steel and Formica. Both rooms sit within the secure perimeter of Johnson Space Center's working campus, accessible only by tram tour from Space Center Houston, the complex's official visitor facility a half-mile south. Space Center Houston opened in 1992 as the public gateway to NASA's astronaut training headquarters. The 250,000-square-foot center houses the world's largest collection of Moon rocks and lunar samples available for public viewing, flown command modules from Skylab and Apollo 17, and a shuttle replica mounted atop the original Boeing 747 Shuttle Carrier Aircraft. The center's Mission Control tours depart every fifteen to twenty minutes during peak hours, though timed boarding passes distribute on a first-come basis each morning. Visitors traverse the Johnson Space Center campus aboard open-air trams, passing active training buildings, the Neutral Buoyancy Laboratory's six-million-gallon astronaut pool, and Space Vehicle Mockup Facility hangars where full-scale International Space Station modules undergo crew rehearsals. The Mission Control viewing galleries allow close approach to both historic control rooms through floor-to-ceiling glass partitions installed during the rooms' preservation in the early 2000s. Audio feeds play original communication loops from Apollo 11's lunar descent and STS-1's first Shuttle ascent. Docents stationed in each gallery field questions about console functions, flight director protocols, and the Cold War engineering constraints that shaped the rooms' analog architecture. The Apollo control room retains its original IBM mainframe interface panels, each toggle and rotary switch hand-labeled with grease pencil annotations from 1960s flight controllers. The Shuttle control room's rear projection screens, obsolete by commercial standards even at the program's end, remain operational for demonstration purposes. Houston Space Center Mission Control tour tickets tours grant access to both rooms as part of the standard NASA Tram Tour, included with general admission or available as a dedicated package with expedited entry.