Abandoned subway stations are awesome. If you aren't convinced, take a look at this:
https://www.thrillist.com/culture/photos-of-abandoned-subway-stations-around-the-world-deserted-underground-tunnels
Or this:
https://youtu.be/6xSzU0oM4mM
I'm trying to write a creepy SCP based around this environment. However, I want it to be more original than "haunted underground complex."
Here are some ideas.
A lot of these stations still have working tracks that subways pass through. What if, when standing on the platform and viewing a train passing by, you can see monsters staring out of the windows. Or maybe people's faces are replaced by something horrific.
My personal favorite idea would be that the station goes on forever, adding new turns and getting freakier as it goes. But I feel like that would be too much like daedaelus' labyrinth, or SCP-184.
I understand that this needs to be a kind of story at some point, but I need help developing a premise from a setting.
Throw literally anything out there, the more ideas the better. Preferably exetremely creepy. Let's try and narrow something down.