Spent a good few hours at St Clement's in Ipswich back in the late 90s, long before it got converted into flats. Few of us went in on a dare type situation, torches, the lot. Nothing dramatic happened but there was this persistent feeling of being watched from the upper corridor, and two of the lads independently mentioned the same smell - something like old antiseptic mixed with something else they couldn't place. One bloke point blank refused to go past the second floor landing and he's not someone who spooks easily.
Old hospitals carry something different to other abandoned buildings. Maybe its the concentration of human suffering in one place over decades, maybe something else entirely. I've been to plenty of derelict sites round Suffolk and nothing else has given me that same weight in the chest feeling.
Anyone else noticed that the experiences tend to cluster around specific areas rather than the whole building? Would be interested to hear if thats a pattern others have picked up on.