Mason-Dixon Line expert David Thaler says the map produced at the end of the five-year survey is one of America's most important documents. He described it as being equivalent to the Declaration ...

William Ecenbarger is author of “Walkin’ the Line,” a travel-history book about the Mason-Dixon Line. This year marks the 250th anniversary of the completion of the Mason-Dixon Line, one of ...

A Mason-Dixon Line marker, located near Delta, was damaged on Sunday, according to Pennsylvania State Police. About 2:40 p.m., police were called to the southern York County border borough to take ...

Outdated maps meant fresh measurements were needed, but colonial surveyors had proved inaccurate. So the families hired Mason and Dixon, who were known in England as master surveyors and astronomers.

Incredibly, Mason and Dixon were successful. The 233-mile line they drew was often accurate to within 100 feet. It was, one historian said, the 18th-century equivalent of putting a man on the moon.

I'm driving along the Mason-Dixon line. Todd Babcock, a land surveyor and amateur historian, rides shotgun. It is a glorious day. The windows are down. The air smells like cut grass. We're ...

The bridge is located in the vicinity of Horner Road, about ½-mile north of the state line with Maryland. Mason Dixon Road is officially designated as State Route 3002 and carries an average ...

The job was the 18th-century equivalent of putting a man on the moon: charting a straight east-west line more than 200 miles through forests, swamps and mountain terrain to establish a boundary bet… ...