My husband works at a place that has two main buildings that are sort of twins of eachother. Probably built somewhere between the 1980s/90s, I'm not sure - but they have no real age to them.
The buildings are just metres apart from eachother and on land that was formerly agricultural, with no known buildings on them in the recent past. They're large, light, airy buildings that are just bland modern structures.
We used to go and do something there at night, weekly, with friends, after the public left the buildings - as we had a set of keys and the owner allowed us to be on site. Anywhere between 4 and 6 or 8 of us. Nobody else on site and we were behind a big, closed gate so no public there or even close. The building we met in was the less "scary" building although as time went on, several of us, when alone on the ground floor, heard a man's voice singing - coming from the closed-down cafe area. This might be at 11 at night or later with everyone in the building on the upper storey and accounted for and no strays. I was the first to hear it, then over time, others did or did at other times when nobody else was in the building. Apparently, it was thought to be a person who had volunteered there and died a few years earlier who was a sort of known fixture but I'd no idea the time I heard it.
But the terrifying building was the other one, that remained closed up. (We had the keys but nobody wanted to step foot in it). It sort of generates, at night, this feeling that is so terrifying, we'd dare eachother to go and look through the plate glass door and see what was going on inside. Something horrific about the feeling of that building. I've helped open it up in the morning, several times when my husband was duty manager, and having to walk through there even in broad daylight, to turn on the lights - you feel like you're being watched. The other building we know to be "haunted"? Not so much.
Both are boring, anodyne, totally un-scary looking in daylight and I did enquire and was told there wasn't anything there other than a field til the 1970s and those buildings slightly postdate that.
Tl;dr - two identical buildings, new-ish, boring looking, side by side. One is genuinely haunted and not at all creepy. The other, nobody has ever had a paranormal experience in, but has a horrible atmosphere. Land underneath just arable field til within living memory.