I was staying in an old castle hotel a while ago and there was a particular small staircase we used that brought us to our room, and just a couple of other bedrooms. Every time I used it, I felt this strong, heavy feeling that there were loads of people around. I remember my husband leaving me on the staircase at one point to run back to the room for his car keys and the feeling was so overwhelming I ran off down to the castle lobby to escape it.
It was the only part of the castle hotel that I felt it, thankfully! Ages later, I was reading a thread somewhere about Irish places that were haunted and there was a post where a girl was talking about an old castle hotel she previously worked in being haunted. I replied to her to ask if it was this place I had stayed in, and she said yes, that there was one particular small staircase off the lobby that was haunted and freaked the staff out. It was the same small staircase that felt so weird to me!
---
Same thing happened to me, after my then partner's sibling died. I got that strong burning, flowery smell and then for ages afterwards that very same smell would just pop up out of nowhere. Even if I was standing still, alone, it would just waft past me. I can still imagine the smell today, even though it hasn't happened to me for years now. It always stopped me in my tracks when it happened.