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I'm planning out a writing project that involves travel to parallel universes, a la Sliders. But I'm having trouble coming up with ideas for parallel universes that go beyond the gimmicky "The world has been taken over by such-and-such civilization/technology/biome/natural disaster!"
I tried searching for random articles on Wikipedia for inspiration, but it turns out most of Wikipedia's articles are for obscure Eastern European villages, football clubs, and Bollywood actors.
So now I'm turning to the Paizonians. What are some cool/fun/dramatic parallel universe ideas to explore? (And I'm excluding cosmic-level differences, so no deadly meteors or tinkering with the fundamental constants of physics.)