In 1806, during the return journey of the Lewis and Clark Expedition, Captain William Clark carved his name into this rock:
“W Clark July 25 1806.”
It remains today the only visible, physical trace left behind by the expedition itself.
But the name Pompeys Pillar doesn’t come from a conqueror or ancient empire.It comes from a child.
Sacagawea’s son, Jean Baptiste Charbonneau, traveled the entire journey with the group. Clark nicknamed him “Pompey,” and on this very day, he named the formation “Pompey’s Tower.” Over time, it became Pompeys Pillar.
Standing here, in the midst of one of the most ambitious and uncertain expeditions in American history, Clark climbed to the top, surveyed the land, and carved his name into the stone.
📍 Pompeys Pillar National Monument — 30 miles east of Billings, Montana