Royston Cave

There have been many stories of "dark, shadowy figures" observed within the cave.

Update 11/5/22: Nicky Paton, the Royston Cave Manager replied to my query about any recent phenomena: "I am in the cave frequently and have not experienced anything myself. However, a few years ago, a lady seemingly appeared to give birth to a spirit and a couple of people have experienced feelings of warmth, but otherwise it's pretty normal."

Link: Royston Crow