Massacre Canyon Monument and Visitor Center
Three miles east of Trenton on U.S. Highway 34
The last large-scale battle between two Native American tribes in the United States occurred near Trenton in 1873 at Massacre Canyon. A hunting party of 350 Pawnee was tracking bison through the canyon when they were surprised by 1,000 Sioux warriors, who attacked, killing 69 Pawnees, most of them women and children. The Massacre Canyon Monument and Visitor Center tells the story and also displays the 1.3-million-year-old fossil of a rare, elephant-like stegomastodon discovered nearby. Open Memorial Day weekend through Labor Day, 9 a.m.-5 p.m. Three miles east of Trenton on U.S. Highway 34.