North Boundary Stone marking the furthest north point of the District of Columbia. Marks the border between DC and Maryland. On the NRHP. Taken by zhurnaly - not by me. Set of photos at <a rel="nofollow" class="external free" href="https://www.flickr.com/photos/zhurnaly/sets/1352644/with/127552554/">https://www.flickr.com/photos/zhurnaly/sets/1352644/with/127552554/</a> Set of 27 (of the 40 boundary stones) all marked CC-by-2.0, all are on the NRHP. Stones were set in a 1791 survey and are called the 1st monuments of the US Federal Government.
zhurnaly (Mark Zimmerman)
CC BY 2.0
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