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The Pursuit of the Pankera: A Parallel Novel About Parallel Universes
by Robert A. Heinlein
There's an excellent reason why Heinlein didn't publish this during his lifetime. It's basically a fan-fiction piece. You have a bunch of poly-math geniuses (let's just call them Mary Sue, Larry Sue, Sally Stu, and Gary Stu) who take their multi-verse travelling car/space-ship off to visit the lands of Edgar Rice Burroughs, Frank Baum, Lewis Carroll, and E. E. Doc Smith with short side-trips elsewhere. Everywhere they go they have adventures where they're never in any appreciable danger but they see how they can fix the troubles of the universe they're in and proceed to do so without any thought for the consequences. There's a loose framing story about some sinister aliens hiding amongst us but it really never gets much traction or goes anywhere meaningful.