Those stairs have no railing. No chance I'm climbing that. That room is lit by an ominous red light. Not going in there. It might have a horror movie door that locks behind me. After waiting to see if I'm alone, I'd try dismantling the stairs. I'm not going up, but something might come down.
If I can't bring it down, I'd probably wander the forest, using the stairs to orient myself. It looks like bad weather for exploring, though.