Similarly, there is a theory that all the Pixar movies (but not the Disney non-Pixar) take place in the same universe, from the Middle Ages to the very distant future. It's pretty complex and accounts for the "Easter eggs" in the various movies.
Here's an article explaining the theory:
http://jonnegroni.com/2013/07/11/the-pixar-theory/
And here's the Pixar Theory Timeline:
www.pixartheory.com.