For a slight change of pace, here's a 35mm Kodachrome taken by my grandmother on a sailing trip around the Bahamas in 1949. View full size.

Extracted sulfur stacked in a "vat" 60 feet tall at Freeport Sulphur Co. in Hoskins Mound, Texas. View full size. 4x5 Kodachrome transparency by John Vachon.

May 1943. Sixty-foot-tall sulfur vat at the Freeport Sulphur Co. in Hoskins Mound, Texas. View full size. 4x5 Kodachrome transparency by John Vachon.

1914. Dr. Charles Campbell and a "municipal bat-roost" in San Antonio, Texas ("for one of man's best friends"), his idea for mosquito control at a time when malaria was a major public health problem in the U.S. Disguised as a favorite bat habitat — a church steeple, complete with cross — the roost was fitted with a trapdoor and stilts to facilitate the harvesting of guano by the wagonload for use as fertilizer. 5x7 glass negative, Bain News Service. View full size.

April 1943. Schoolchildren in San Augustine County, Texas. 4x5 Kodachrome transparency by John Vachon, Office of War Information. View full size.

1864. View from the Capitol at Nashville, Tennessee. View full size. Wet collodion glass-plate stereograph negative by George N. Barnard.

1864. Union Army soldier at Confederate fortifications outside of Atlanta. Wet collodion glass-plate negative by George N. Barnard. View full size.