A mousepad sent to us from the District of Columbia Association of Land Surveyors. Rewritten here for easier reading: "DC's 'Surveying...

From picture above: "The Duvall Foundry 1050 - 30th Street, N.W. Built between 1856 and 1866 as a machine shop by William T. Duvall, The...

In April 1791, at the behest of President George Washington, 40 sandstone markers were placed during a multi-year boundary survey of the...

Did you know there is a USGS streamgage at the Georgetown Waterfront Park? This one of many streamgages that measure the height...

Built in 1766, The Old Stone House at 3051 M Street, NW in Georgetown, DC is the oldest structure in the district...