December 18 - Discovery of three villages by Richard Wetherill and his brother-in-law Charlie Mason while tracking stray cattle: Cliff Palace, Spruce Tree House, and Square Tower House; now part of Mesa Verde National Park.
^Saunders, Nicholas (2007). Alexander's Tomb: The Two-Thousand Year Obsession to Find the Lost Conqueror. Basic Books. p. xii. ISBN978-0465006212.
^Thompson, M. W. (1977). General Pitt-Rivers: evolution and archaeology in the 19th century. Bradford-on-Avon: Moonraker Press. pp. 100–1. ISBN0-239-00162-1.