In 1763, Penn and Calvert commissioners erected milestones along the boundary between Maryland and the Three Lower Counties (Delaware), part of the Mason-Dixon survey. Every five miles they erected elaborate Crown Stones. This stone was displayed in St. Louis in 1904, and later in Baltimore. It was returned to Marydel in 1954 and was reset in 1964.

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The Delaware Public Archives operates a historical markers program as part of its mandate. Markers are placed at historically significant locations and sites across the state. For more information on this program, please contact Connor Graham at (302) 744-5019 or via email at

LOCATION: Marydel, on the Maryland-Delaware line, 14 miles west of Dover