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- Day 4
- Monday, September 8, 2025 at 2:42 PM
- ⛅ 30 °C
- Altitude: 879 m
United StatesYellowstone County45°59’14” N 108°0’18” W
Pompey's pillar
September 8 in the United States ⋅ ⛅ 30 °C
William Clark carved his name here during the Lewis and Clark expedition 1806