I thought I'd just add a couple more points about "wildernesses," such as they might be.
I grew up in a place where it was a simple matter to get in the car, which was a pickup truck, and go "down to the river," as we would say. I would go with my uncle and cousin and sometimes others. The places we went were unimproved, unofficial and wide open, at least in the sense you didn't need a permit and you went through no gates. That has changed somewhat but most of the places are still there in exactly the same condition they were in 60 years ago. These are places that were along an old (by American standards) road equally unchanged in the last 200 years but long since bypassed. In fact, some of my ancestors were the first settlers in that area. Part of the area is now a public hunting and fishing preserve, also called a wildlife management area. Different names are used in different jurisdictions but I don't know if there is a British equivalent. Anyway, parts of it are closed to traffic except for foot and horses. All of it is relatively difficult to get to, however, which naturally keeps down the number of visitors, so it's only the local folk who go there, provided they have at least a pickup truck.
There are places there which are perfect for long hikes, with no climbing and a good view. In contrast, the Applachian Trail, which I often mention, is relatively difficult and usually with no view of anything but trees. On the other hand, many 100% natural places are less than attractive as places to relax and while away your time. They can be muddy, smelly (especially the creeks and rivers), thick with poison ivy, briers and stickers and sometimes swarming with insects. But you get used to all that.