>>1450396The rotting wood beams are the remnants of railway tunnel trusses. For real though, don't go past the rubble berm if anyone actually goes here unless you have a gas analyzer, helmets, and balls of steel. Not that any of those things will help you if a one ton rocks falls off the ceiling and squishes you. The surrounding area has what's left of an 1800s settlement, mostly glass shards and a few cabin foundations. Lakes are stocked with fish I think.