I wonder if it's been discussed before?
There has been a strong interest in building living facilities for horses (we used to call them barns and paddocks, or stalls and runs -- ) that work to duplicate more wild conditions.
One feature is to use rough ground on your property and put a labyrinth of relatively narrow pathways out for the horses to travel over. Travel is encouraged by putting out feed at various points along the pathways.
Rocky rough ground is preferred and some folks have even graveled sections to help with good hoof exercise and health.
With spring coming up for those of us in the northern hemisphere dreams of paddock and yard building no doubt come up often. I know I'm trying now to map out pathways on my little wooded 1.5 acre or so for Altea and her new foal to wander about and play. Lots of stumps to climb on, and a little hill or two, little thickets of brush to explore, big big trees to snooze under on warm days.
No overnights outdoors though. My three stall barn is lion, bear, and coyote proof as we have them hereabouts and they have been known to attack livestock.
What have you worked out for your horses, where you can do so, to more naturalize their living area?