NASA Saturn V Aft View of Saturn V Third Stage (S-IVB) 9903170.jpg

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There are still 3 Saturns on display.
http://history.msfc.nasa.gov/saturn_apollo/display.html
One is at
Johnson Space Center

The Saturn V on display at the Johnson Space Center has been assembled from
stages associated with all three missions mentioned above. The first stage
is from SA-514 and designated S-IC-14 from the cancelled Apollo 18 mission.
The second stage (S-II-15) is from SA-515 the Skylab backup vehicle which
NASA did not use. The third stage (S IV-513) was originally part of SA-513,
the launch vehicle selected for Skylab.<13> Unlike the three-stage Apollo
Saturn V configuration, the Skylab Saturn V configuration only required a
first and second stage since the Saturn V upper stage was replaced by
Skylab. This allowed NASA to designate the third stage for Apollo 18. That
mission was cancelled, however, and the third stage eventually became part
of the Johnson Saturn V display. <14>