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I walked behind them across the street through the tunnel in the mountain into the village.

Q1) Is the sentence above correct?

Q2) Is "behind, across, through, into" grammatically modifying the verb "walked"?

Q3) Is only "in" used to modify "the tunnel"?

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I walked behind them across the street through the tunnel in the mountain into the village.

It's not entirely clear from the structure of the sentence, but it appears that the four underlined elements are intended to form a coordination of PPs, each functioning as complement of walked.

Within the third PP is the smaller PP in the mountain, which modifies tunnel.


Incidentally, where did you find this sentence?

Comments  
fire1Q1) Is the sentence above correct?

It is possible, but it sounds playful and breathless. It would normally be written "I walked behind them across the street, through the tunnel in the mountain, and into the village." Also, it seems like a short sentence for such a relatively long trip.

fire1Q2) Is "behind, across, through, into" grammatically modifying the verb "walked"?

Are.

Yes.

fire1Q3) Is only "in" used to modify "the tunnel"?

Yes.

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 BillJ's reply was promoted to an answer.
BillJIncidentally, where did you find this sentence?

I made the sentence to get answers from native speakers on whether the sentence could work.

If it is not recommended to ask questions with sentences I make on my own, I will avoid it.