Hiker Finds Building Without Doors or Windows, Then Hears A Sound Coming From The Top

On the roof

Albert carefully climbed onto the sloping roof, testing each step before putting his weight down. The old tiles shifted beneath his boots, making him worry they might crack and send him tumbling down. Up here, the screech sounded louder. And after a while, it came through the vents continuously, without pausing. “What is doing that?”