Boundary Marker SW-9 in Arlington, VA is a historic site that holds significant importance as one of the original boundary stones marking the ten-mile square of the District of Columbia. Dating back to the 1790s, these stones were placed by Major Andrew Ellicott's team and serve as the oldest federal monuments in the United States.
With thirty-six stones from the 1790s still in or near their original locations, Boundary Marker SW-9 offers visitors a glimpse into the early history of the nation's capital. The site's rich historical background, including the involvement of prominent figures like Benjamin Banneker and George Washington, attracts those interested in exploring the roots of Washington, D.C.'s establishment.
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