I wonder if its more common to notice interesting and special places when in nature versus in the built environment. All of your examples are from nature, and most of mine would be too. But considering it further... in college there was a nook I found on the second floor of a nondescript building, where lounge chairs were built into the floor and covered with astroturf, and at just after midday the sun would shine down on it through a sort of compluvium in the roof. I'd been on that campus for almost three years before I discovered it, and only visited a few times because it was quite out of the way. But what a quiet little refuge, I hope its still there.