A while ago I had my first interview for an office job in Fremont. I'd normally take the train but this time I borrowed a car and drove. Took a different route back and spotted brick ruins that looked more like something from Ancient Rome than anything in the earthquake-prone brick-unfriendly Bay Area.
Immediately pulled over some distance away and slid down the embankment from the roadway down to the damp ruin site, fucking up my formal interview shoes in the process and getting my tie snagged on a bush. I didn't want to risk tearing my nice clothes on barbed wire so I went around until I found a hole in the fence where someone had clearly recently entered. Once inside, I found a number of tunnels leading from the brick ruins, built into a cliffside, into the earth. One was full of rather nice suitcases, conjuring mental imagery of some sort of mafia or cartel stash of drugs and money.
Despite my curiosity, the sun was setting, I didn't want to screw up my formal clothes given I had another interview the next day, didn't have a decent flashlight, didn't have much charge in my phone, and I couldn't be late home. So I left without exploring further, but I'll be going back sometime. Apparently the whole thing fell apart in the 1906 quake (brick structure moment) and has been decaying ever since.