Captain Clark named a large sandstone pillar "Pompey's Tower" after Sacagawea's son, later changed to "Pompey's Pillar." The document describes Pompey's Pillar and the inscription left by William Clark, as well as views from the top of the pillar overlooking the Yellowstone River. It also describes the Custer Battlefield, where 220 soldiers were buried after Custer's Last Stand against Native Americans, with some officers later relocated and Custer buried at West Point. Native American memorials at the site commemorate over 100 Native Americans killed in the battle.