Pompeys Pillar National Monument
Pompeys Pillar National Monument
Pompeys Pillar National Monument, located along the Yellowstone River, is a striking sandstone formation filled with history. For thousands of years, Native American tribes, including the Crow, used the landmark for travel, hunting and ceremonies, leaving behind petroglyphs and pictographs that can still be seen today.
The site is most famous for the signature of Captain William Clark, carved into the rock during the Lewis and Clark Expedition in July 1806. This simple inscription remains the only physical evidence along their trail.
Visitors can follow a boardwalk to the top of the Pillar for sweeping views of the valley and a close look at Clark’s mark. The modern Interpretive Center shares the story of the expedition, Native cultures and local wildlife with engaging exhibits and art. Picnic areas and riverside trails make it easy to spend the day exploring.