Here are all the terrifying, shocking, and extremely disturbing things I learned about recently. Some are stories from just last month, and some are stories from many years ago. Warning: Graphic content ahead, including stories of murder. 1. In January 2019, real estate investors inspecting a vacant Philadelphia house narrowly avoided triggering a deadly booby trap . A staircase had been rigged with a tripwire that, if disturbed, would release a crutch with a large knife duct-taped to it, swinging down at head level. The group spotted the wire just in time and tested it with a pole, confirming it could have caused serious injury or death. No one was hurt, but the setup — along with hazards like glass shards on the stairs — suggested it was deliberately designed to harm whoever entered. Authorities never publicly identified who rigged the trap or why, and the incident remains an unsettling example of the risks inside abandoned properties. 2.…