If you ever have the opportunity, visit the Cosmosphere in Hutchinson, Kansas. They have the actual Apollo 13 Command Module on display.
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They have, IIRC, one of the Gemini capsules, but also some really cool demonstrations. It is worth it to time that and one of the Trinity test site tours if you're interested in nuclear history as well, then take a trip north to Albuquerque for the Nat'l Nuclear History Museum and (for the kids and kidlike adults) Explora is a neat little hands on museum.