On October 18th 1767, Charles Mason and Jeremiah Dixon complete their survey of the boundary between the colonies of Pennsylvania and Maryland as well as areas that would eventually become the states of Delaware and West Virginia. The Penn and Calvert families had hired Mason and Dixon, English surveyors, to settle their dispute over the boundary between their two proprietary colonies, Pennsylvania and Maryland.
The line became a dividing line a hundred years later during the Civil War as a loose demarkation of the North and the South.
I've hidden a micro here on the little used side road that skirts the edge of this famous border. Another in a series of caches to help you get your "cache names beginning with numbers" quota. Easy to find but be careful of the traffic on this back road used by the two power plants close by... and BYOP!