Ideas for my improbable monument

A monument to the Earth.
- For its ability to recycle and regenerate
. A hole in the ground. People would come and add one thing they would have thrown away (anything but organic material). Then everyone would have to realize/remember that we manufacture many un-natural materials that take years if not centuries to degrade.
. A square of dirt left unattended. Over the years people would see what is the natural restoration process. For example today I visited a friend that I visit very frequently. She has a barrel of dirt on her front stoop (very unattended) and I always think how bare and full of weed this thing is. But today a "weed" flowered into gorgeous and numerous bright pink blossoms!
- A monument to the re-unification of humanhood with the rest of the planet.
It could be a small forest inhabited by many wild creatures (a mini-Eden) in which one enters to commune. At its center, a meadow allows the visitor to experience oneness with nature, either in silence or in communion with others through ceremonies and rituals.