I've got a long list but this place is dear to me. I saw a painting of it behind a desk of C.S Lewis in a movie called Shadowlands with Anthony Hopkins and I knew I had to find it. It is called Symonds Yat. On the Welsh border.
I hiked over the back of the "sleeping dragon" as they call that elevated wooded area in the center. it took a lot longer than I had planned for and I ended up knocking on someone's door and asking if they could take me to the train station. They were very nice and I caught the last train out that evening. Something magical in there.