I just accidentally found a feature! It is almost a perfect circle in the vegetation that measures 154.5 m (500 ft) N-S & E-W.

I now have to delve into this further!

@J_Green_505
I think I know what it might be. There was one near my great uncles, though not 500 ft.

I've confirmed my suspicions. It will make a good thread on why it remote sensing & #LiDAR takes not only training, but experience to know what you're looking at.