Here’s a reasonably good image of the earthworks at Moel Fenlli. Scanning from right to left, see how the hillside dips abruptly into a ditch and then rises again in a rampart? That’s man-made, circa 3500 BC. Imagine digging enough of that to surround a whole village. Now imagine doing it with nothing but a hand shovel.
It’s amazing to me that people before the advent of the backhoe could alter the landscape in such a profound way that the footprint of their village would still be visible five thousand years later.
Standing on Moel Fenlli’s ramparts, you really are on top of the world. Like I said: You can see across whole kingdoms.