Jefferson Pier
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Jefferson Pier, Jefferson Stone, or the Jefferson Pier Stone, is a stone in Washington, D.C. that marks the second prime meridian of the United States even though it was never officially recognized, e
West side of Jefferson Pier with Washington Monument in background (April 2011)
West side of the Jefferson Pier, showing crossed longitudinal and latitudinal lines on top of the monument (September 2009)
Inscription on west side of Jefferson Pier
L'Enfant Plan
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The L'Enfant Plan is an urban plan for Washington, D.C. designed by French artist and engineer Pierre Charles L'Enfant in 1791. It is regarded as a landmark in urban design and has inspired plans for
U.S. Coast and Geodetic Survey (1887)
Design of the Federal City: L'Enfant Plan of Washington Superimposed on the Rectangular System From which He Worked (1930)