A mission to Saturn launched in 1997 and operated jointly by NASA, ESA, and the Italian Space Agency to study Saturn’s atmosphere, rings, and satellites, including a fly-by of Enceladus. The mission was launched on 15 October 1997, entered Saturn’s orbit on 1 July 2004, and ended on 15 September 2017, when it entered Saturn’s atmosphere and burned up. See also huygens.
http://saturn.jpl.nasa.gov/ A joint ESA and NASA mission that studied Titan, moon of Saturn, and carried the Huygens probe.