Located in the village of Cannock Wood, Staffordshire and inhabited around A.D. 50 by the Celtic Cornovii tribe, the Castle Ring is an Iron Age structure commonly known as a Hill Fort. It is 801 feet above sea level; its main ditch and bank enclosure is fourteen feet high; and, at its widest point it is 853 feet across. In other words, the Castle Ring is a fine example of what ancient man was up to thousands of years ago.
But beyond that, Castle Ring is a definitive "Window-Area," one filled to the brim with sightings of Bigfoot-type beasts, UFOs, spooks and specters, and even - back in the 1980s - a Gargoyle-type entity!
Why? I have no idea. Except to say: Window-Areas seem to pop up all over the world (a classic locale in the 1960s was surely Mothman/UFO/Men in Black-territory: Point Pleasant, West Virginia).
Doorways? Portals? Maybe. But doorways from where...?