Lunar Orbiter

Lunar Orbiter was the project that mapped the Moon in preparation for the Apollo landings.  A total of five Lunar Orbiters were flown to the Moon. They were built for NASA's Langley Research Center by Boeing and launched to the Moon on Atlas-Agena rockets. The first three orbited around the Moon's equator and provided detailed photographic coverage of the primary Apollo landing sites, including stereo images.