Regarding PP and Sussex, I grew up there, and spend many years being taken dragged on walks. My DDad used to repair churches, so at least once in every school holiday, I used to have to go with him to work. Church, graveyard, for the day.
The top of the Downs, I've always felt very safe with, there is a purity of feeling there.
Devil's Dike feels strange. It's probably the way it muffles and distorts the wind. I always felt very disoriented there, like I've been spun around and I can't tell which was is front.
The legend says that the Devil Himself was trying to dig from the Weald through the Downs to the sea, to flood the Weald. He could only dig for a single night. Someone in a Weald village heard Him, and in the early hours of the morning, got up and lit a candle. The Devil, seeing the candle flame in the cottage window, mistakes it for the dawn, and flees away.
Chanctonbury and Cissbury Rings make me feel very nervous, there is something primitive there, watching you.
We had a very strange one once, near Stenying. Wooded road, driving along. About to turn right, into a different road. At the road junction ahead, we saw what looked like a person standing on the left. It was like a 2D cutout of black shadow. Thin and tall, with clear long legs and arms, but in proportion. We indicated to go right, and the thing crossed the road, with one leg reaching to the other side, elongating, then the body and other leg followed over. As we left the original road, we then couldn't see it on the right side of the original road, or on the left of our new road. It was sodding creepy, the way it moved, and that there was no detail to is, just a black cut out. We did wonder if it was trying to get onto th car, as when it crossed, we would have been driving right over it, if we hadn't left that road. Crossroads were often chosen as placed to bury those outside societal norms.
We also had (differently) odd one, with my DDad at work. He was in the crawl space underneath some box pews (Downs church, box pews directly over the chalk bedrock). Could see something over in one corner of the space. Crawls up to it, to find a human skull. DDad said he never crawled backwards as quickly, before or after! Police were involved, there was no recorded burials or interments in that part of the church. The skull and disarticulated bones found were very old. However, there was the story from the 1700's, that the priest had been rather too friendly with the local Lord's daughter, and had disappeared one day. I think it is unlikely he was out under the pew (the smell of decomposition in the church?) But did wonder if the bones had been dumped back there, afterwards.