I love stones. These particular ones are at Natural Stone Bridge in the Adirondacks, part of the oldest stone outcroppings in North America. We're talking old, as in a billion years.
The one in the first photo contains a little pool under a natural spring that trickles out of a mountain.
This second one is about three feet across and was trapped in a pothole during floodier times.
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*Natural Stone Bridge and Caves