Re York, when I went with a dd some years ago, we visited the Treasurer’s House (IIRC) where there’s a B&W video of an old man (since dead) telling of how as a young man he’d been in the cellars working as IIRC an electrician or plumber on something.
He heard something like a trumpet call, but assumed it had come from a radio upstairs. Very soon afterwards he saw, coming through the wall, a troop of Roman soldiers, visible only from around knee height upwards. Petrified, he flattened himself against the wall, but they ignored him completely, and, as he said, looking tired and dishevelled, carried on and disappeared through an opposite wall.
When he eventually emerged upstairs, looking presumably white-faced and in shock, someone said, ‘Oh, you’ve seen them, then.’
He was asked to describe the clothing and helmets, and historians at the time (IIRC this was in the 60s) said they were all wrong, but later it was realised that his description was correct.
During later excavations in the area it was found that the building was right on the path of a Roman road, and the knee-upwards only appearance of the soldiers would tally with the road surface level at the time.