The National Gallery 's fountains were turned by Candoro Marble Company , which once ran the largest marble lathes in the United States .
Notable buildings such as the National Gallery of Art in Washington are constructed of Knoxville marble .
The National Gallery of Art   's fountains were turned by Candoro Marble Company , which once ran the largest marble lathes in the United States .
Notable buildings such as the National Gallery of Art in Washington are constructed of Knoxville marble .