endless spaces are currently prominent in horror popular culture;
http://en.wikipedia.org/wiki/The_Backrooms http://scp-wiki.wikidot.com/scp-3008
http://en.wikipedia.org/wiki/The_Backrooms http://scp-wiki.wikidot.com/scp-3008
That predates both the 2019 4chan Backrooms and the 2017 SCP-3008 page.
I meant more like old school creepy pasta websites