We have added searching for benchmarks to our treasure hunting fun. In areas where there weren't any buildings to use, they used rocks. We found a couple in the hills on our trip.
What is a benchmark?
A benchmark is a point whose position is known to a high degree of accuracy and is normally marked in some way. The marker is often a metal disk made for this purpose, but it can also be a church spire, a radio tower, a mark chiseled into stone or a metal rod driven into the ground. Over two centuries or so, many other objects of greater or lesser permanence have been used. They can be found all over the USA. They are used by land surveyors, builders and engineers, map makers and other professionals who need an accurate answer to the question "Where?"
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