Studying the anomaly

Kevin crept closer, circling this impossible structure. From every angle, it resembled an ordinary city metro entrance. A roof of grimy glass stretched above rusted steel beams, though vines now curled around parts of the frame. Wild grass surrounded it where sidewalks should have been. Directly before him stood a heavy iron gate, sealed tightly. Beyond its bars he glimpsed escalators vanishing into darkness, a staircase of steel descending deep into unseen depths beneath the forest ground.
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