I tried just searching on google/safari but there useless 
You didn’t say which direction you wanted the hallway to be going so I’m not sure if either of these are what you’re looking for… perfectly fine if they aren’t lol but i found these two
Summary
Not sure about their size as I’m on my phone and so haven’t tried it out sorry
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Thank you for the recommendation! 
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I don’t know any but you can search up “hallway” on pixabay, I’m sure.
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