English: Natural gas tanks at 26th & G Streets, Washington, D.C., in 1905. For more than a century, this site belonged to the Gas Works of the Washington Gas Light Company, which produced "manufactured gas" (a mixture of hydrogen, carbon monoxide, methane, and other flammable and nonflammable gases) for heating, cooking, and lighting throughout the city. Gas production ceased at the site in 1947, and the plant was demolished shortly thereafter. In the early 1960s, the Watergate complex was built on the site. The 1905 photo was taken by Harris & Ewing photography studio. The glass negative was part of the collection given to the United States' Library of Congress in 1955.