Search and Rescue Woods
I worked in search and rescue for several years, and while most calls had perfectly ordinary explanations, there were a handful of incidents that none of us ever talked about outside the team. New volunteers were always told to focus on the missing person, stay with their partner, and never wander off because "curiosity gets people killed." At first I assumed that was just another safety rule. It wasn't until my second year that I understood why some of the veterans looked genuinely uncomfortable whenever certain topics came up around the campfire.
One of the strangest things I ever found was a perfectly normal staircase standing by itself deep in the forest, miles from the nearest road or abandoned building. There was nothing attached to it, no foundation, no rubble, nothing to suggest a house had ever existed there. It looked almost new, as if someone had built it that morning and walked away. When I radioed my supervisor, he interrupted me before I could finish describing it and simply said, "Mark the location if you need to, but don't go near it. Leave immediately." When I got back to base, nobody asked questions. They just nodded like I'd experienced something every veteran eventually does.
The stairs weren't even the worst part. During searches we'd occasionally hear someone calling for help from deeper in the woods. The voice would sound exactly like the missing person, sometimes even like another member of our own team, but it always came from somewhere that didn't make sense. More than once I heard my partner calling my name over the radio while he was standing right beside me. The older officers always repeated the same rule: if you hear someone calling you from the trees and you can't physically see them, don't answer, don't follow the voice, and definitely don't go looking alone. I don't know what causes it, and I don't want to. Some things out there are never officially written into the reports, but every experienced rescuer eventually learns the same lesson, not everything in the woods wants to be found.