Dannotations
I'll watch some of these videos when they pop up in my feed. Some of my favorite books fall under this genre, beginning with Creepers by David Morrell which is available on BARD. As a youngster, I explored the underground sewer system of my city. We'd access it through the street storm drains or the river.
Happy Metalhead
Sassy Pants
Sky pilot 77
I have an incredible urban exploration story from the 90s. Too long to tell in this thread. Maybe I'll make a post of it. Freaked me the hell out! 
The AI wizard
Sassy Pants
Now that’s freaking awesome. I love that. LMAO it’s so nice to hear other people talk about their experiences or knowing people who have done it. 
Sky pilot 77
I have a friend who actually urban explored the old Fairfield Hills asylum in Newtown, Connecticut. Which is about a half an hour from me. Extensive tunnels beneath the complex. 
zackmack2000
Redneck Zack here, they do a good job at describeing stuff on that for sure. Lol, the matlock theme in the background. That's wikid. That just adds to it.