A Teenage Girl's Room

What William was seeing, on its own, would not be too unusual. It was a room. A bedroom to be specific. And the style and decor led William to the conclusion that it was the bedroom of a girl, most likely a teenager. But none of that was necessarily odd. What was odd was the fact that it was even here. What was a bedroom like this doing attached to the middle of a dark, cavernous hallway?

And that was the other odd thing - sunlight was streaming in through the windows at the far end of the room. But the hallway, and William's basement lab, had to be least several feet underground. It was a large room too - it expanded beyond the position of several of the other doors in the hallway, but as William poked his head through he saw that there were no other doors on this wall inside the bedroom.

"Hello?" He called out, curious if anyone was inside. No answer.

William looked back up and down the hallway, wondering if he should check another door. But he had come this far already. He had endured the infinite pain of passing through that crack. Whatever was on the other side of this door couldn't be so bad. He took a deep breath and stepped through. As he crossed the threshold, though, the door quickly slammed shut behind him.