Outside of DC is the Horton Vineyard. They produce a large selection of wines, and outside of their HIGHLY underrated Viognier, their Norton is quite interesting and unique. The history behind this varietal is also pretty cool - it was the original grape grown by colonists way back when. Thomas Jefferson raised their grapes for wine production on his Virginian estate even.

The wine itself is more interesting than good, IMHO. The color resembles some of the darkest northern rhone/central coast syrah's I've seen. It's basically like squid ink in color. The taste characteristics as I remember them are very terroir driven, with lots of pine needles, wet mud, and manure. If you're into "old world" style wine (cote rotie/bordeaux/cornas/etc) you might find this bottle interesting too.