One of the locations my small photo group visited recently was the Natural Bridge at Sewanee. After walking the steps down from the parking lot, we see the stone arch. It is obvious to me that the best vantage point will be from down below and the easiest way to get there is to walk across the bridge. So I begin the journey over the narrow path. I admit that later I wondered if one or two people crossing it might stress it too much and cause it to collapse. Nah, that wouldn't happen. It's been there a long time, but isn't that the point, it could be closer to the moment of failure. How many hundreds, thousands of people had crossed over this bridge? How many years of erosion had created the bridge and how many more years could it exist? The end wasn't that day, and probably not next year or ten years from now. But I admit that I wondered.

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