The museum for all things space, including just so, so much from Apollo and other missions - is the Kennedy Space Center in Florida. Highly recommend.
Even just seeing their "rocket garden" is incredible, but all the Apollo stuff, including a GIGANTIC Saturn V rocket you can walk under as it hangs horizontally in a large hanger is amazing. Go to the actual Apollo moon landing control room. And see the Shuttle pads, Vehicle Assembly Building (4th largest in world by volume), and even meet past astronauts.
Now as for your specific question, you'd go to the building with the Saturn V rocket called the Apollo / Saturn V center. In addition to the rocket, there's the Apollo 14 command module, an unused service module and an unused Lunar module.