Washington, DC Historical Benchmark Tour featuring Dave Doyle

Today Rich and I came across this awesome video featuring Dave Doyle, former chief geodetic surveyor of the National Geodetic Survey, giving a tour of historic survey monuments in Washington, DC. We learned so much from his presentation, and we even bought the book (The Jefferson Stone, by Silvio Bedini) that he recommends in the video.

Follow along by checking out the NGS datasheets linked from the map below. You can also download a .gpx file of the markers shown in the video.