Rici Depetris, 10, learns about the Mason-Dixon Line’s history while talking to re-enactor Ed Robey in the persona of Chief Catfish, whose relatives visited the surveyors in 1767. Their visit was noted in the journal of Charles Mason.

West Virginia surveyor Don Teeter, far right, uses a historic “chain” to show the distances that are drawn out by the brick and stones that now mark the “Mason-Dixon Line” between Pennsylvania and West Virginia at the third crossing of Dunkard Creek Recreation Area. This feature shows the length of rods installed by volunteer surveyors from Pennsylvania, present-day West Virginia and Maryland.

Steve Saines, playing an Army geographer between 1777 and 1783, shows some of the maps that were used by surveyors to establish the boundary lines on the Western Frontier that helped define the new nation.

Mason-Dixon Line Preservation Partnership member Todd Babcock, left, talks with Tony Holbrook, who was playing an Army geographer, and Lorna Hainsworthy of Randallstown, Md., during the dedication ceremony Sunday at Mason-Dixon Historical Park.

Boy Scout Christian Fortuna speaks to event organizer Pete Zapadka after participating in the closing ceremony Sunday of the 250th anniversary of the ending of the Mason-Dixon Line survey.

An unidentified girl walks in flip-flops as she tries carrying wood the way indigenous women did. The encampment represents life in the 1700s for the indigenous people who accompanied Charles Mason and Jeremiah Dixon. Re-enactors set up in the meadow on the Pennsylvania side of the line where the surveying team stayed before returning east.