When we first moved to the "country", we knew had a pond, errrrr a hole in the ground. Later that year, I discovered, the "swamp". Between the swamp and the pond runs a divit, a ditch, a low spot. The first several years that divit was wet, mucky. Hindered us from accessing the back of the property from the east side. I wanted a bridge. Nothing expensive, just a way to get over the muck.
After several years of, mmmmm, well, whining, Man said, "we are gonna build a bridge". As home improvements tend to do, it went from in my mind a few simple pieces of lumber to, a master piece of manly design. It also went from "we are going" to build it, to call in the pro!
A huge hunk of $$ later, and we have this lovely bridge down in the woods. The next 5 years or more we had a drought, and there was NEVER any water under the bridge. Wasn't mucky either. Figures, eh?? LOL
And, therefore the name, Carol's Folly. A bridge over dry land.