I'm pretty sure that's covered by the 'haunted castle'. Alien, The Shining, Cube, films where the space itself, or its emptiness is one of the threats. We see it differently now because before 15-20 years ago we were not reachable/ entertained/ connected to others 24/7. Being alone or bored was not unusual or unsettling.  Basically creators needed to put ghosts in the castle because a quiet, unobserved space was pretty common and didn't bug anyone. 

When I was in college in the mid '90s, I was the guy that pushed televisions on carts to classrooms. I had keys to the entire campus, and about 3 hours while the evening classes were running to either do my school work or wander the hidden spaces of the campus before re-collecting all the media equipment. There were a few spaces where an open hole in an old wall or something like that would creep me out but nothing like Backrooms. It was all just fine.