A big treehouse
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A greenhouse (lol these are stretches)
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A supermarket
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Omg a museum with like cool stuff in it
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Something with dinosaurs omg
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Graveyard or something spooky
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Town with a few small houses and a playground outside
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Underwater themed (but not actually underwater ofc)
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A boardwalk with little shops or tents
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Amusement park? (Good luck figuring out how to do that)
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Go to sleep tiger n look at this tomorrow lol vb is important so gnnn <3
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Airplane or crashed airplane in the woods
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An abandoned mineshaft omg
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Ski resort 
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Traffic jam
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Junkyard
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Sewer (or sewer under one of my other ideas)