Many of our prehistoric stones, barrows, etc remain in the wild places of the moors and high mountains, the last remaining bits of 'wildness' in this small country, perhaps that is what draws people to seek prehistory out.
The word "remain" is the rpoblem. When the old time people were pushing the stones and digging the chalk they were emphatically ***not*** doing those things in wild places. Their whole impetus was to tame places, make wilderness bend to their needs, feed them; to protect their children from the wolves and the birds that wanted to eat the crops.
Then of course came the Little Ice Ages and the rains that made the peat grow five or six feet deep around the stones, stones long abandoned to a resurgent wilderness. Bummer.
Wilderness is a wonderful thing, so long as you don't have to actually depend on it for a living.