>>96129736 (OP)I grew up in the city in the Mojave Desert surrounded by hundred year old, abandoned silver mines.
During the height of the Satanic Panic, literally every child heard that one of those abandoned mines contained "the Satanist Caves" where a cult met. So, naturally, about half the teenage population spent highschool driving around dirt roads in the middle of the desert exploring hundreds of abandoned mines.
My friends and I never found them... so we made them. Took the Simon Necronomicon, a few cans of black paint and some cans of red spraypaint. painted the entire walls of one of the largest galleries in one of the caves all black with latex housepaint, then painted the gates of the Necronomicon and all its spells in red spraypaint or wrote them in red markers.
A decade later I was with the family and my little brother mentioned that he and his friends had actually found the satanist caves, and I had to explain to him that it was just his older brother and my buddies being retarded teenagers.
This city is also outside the naval weapons testing facility. So the minigolf course had obstacles made out of the hollowed tubes of missiles. So when the minigolf closed, we stole all the (never operable, purely hollow tube) missiles and moved them into the back of one of the caves so that, if you climbed all the way back there, you'd find a cache of what looked like missiles at first glance (this was in the 90s).
The city has since installed a massive steel grate over that and many of the other easily accessible mines. My brothers and his friends would back a jeep up to the vertical shafts, drop a tow cable and climb down. They'd drop a ton of glowsticks and go swimming, because water table. I'm shocked they haven't all died of heavy metal poisoning, yet.