Duvall Foundry - View this location on map  Canal era warehouse built and operated as a foundry by William T. Duvall until c. 1870; used as veterinary hospital in early 20th century; 2 stories, gable roof, brick facade with piers; large arched opening on second floor, canal side; built c. 1856, moved c. 1974 1050 30th Street, NW, Washington , DC Historical |