What can be done to cover an old coal pit hole in my concrete patio?

My front patio is hollow underneath. There was once a coal furnace under the house and they used an approximately 15" hole in the patio to shoot coal under the house. We removed the ugly metal cover they had "just laying on it". We put my sons sand box over it to avoid an accident of anyone falling in or tripping over the cover they had on it. I'm to the point of wanting a change. Any ideas?

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