We went to this attraction thinking it would be a wall or ledge with a few grooves in it. We were very pleasantly surprised to find these massive grooves carved into the rock by the movement of the glacier thousands of years ago. It was much larger than we thought it would be. There are informational signs at various points as you walk around the fenced off area. You could spend as little as 10-15 minutes at this, or could take your time reading all the information for closer to an hour. The sad part is that the best and deepest grooves had already been removed by the time the area was preserved according to the information presented. But this is still impressive.
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