top one is Denbigh Hospital. The forked corridor and the mortuary is High Royds. The yellow and black striped "hazard room" is an art installation at Deva Asylum. The forked staircase is St John's Hospital Lincoln. The dentist's room is Cane Hill.
This image found in a virtual domain was very difficult to make any sense out of. There are random characters everywhere and odd images put together which makes it impossible to tell if its from a book, comic, or just someone's doodle so it is under a high cognitive effort.