It is located on Santiago Island. There's a little grotto that comes up through the volcanic rock that lines the shore. When it fills up with water, it makes a whooshing sound that supposedly is like a toilet. I can't say I noticed it - maybe the tide was too low. But combine the two thoughts, and you have what is called "Darwin's Toilet." I think that's what is shown in the photo, although I'm not 100 percent sure I picked the right "opening."
It's still quite interesting to think that Darwin walked on this same piece of land almost two centuries ago, and not much has changed since then. Did he climb into this opening in the rocks? Who knows? But he spent two full weeks there collecting samples of life. He noticed that some species were similar to the ones on other islands, but not quite identical. It was a big step forward in his research.
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