2021-05-07 - Grand Canyon West, AZ - Photo By Robert Ellis, Robert Ellis Woodworking Robert writes, "My wife Tammy is shown here taking pics for other visitors. The structure in view is all that remains of unsuccessful attempts of harvesting Bat droppings (Guano) that was to be used as commercial fertilize. The link to the full story is here: https://www.mygrandcanyonpark.com/park/history/bat-cave-mine"
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