Pompey's Pillar National Monument MT
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Description: Pompey's Pillar National Monument is located in the state of Montana and is named after the famous explorer William Clark's nickname for Sacagawea's son, Pompey. The monument is home to a massive sandstone rock pillar that stands over 150 feet tall and is adorned with ancient Native American petroglyphs. This historical site is significant as it marks a portion of the Lewis and Clark Expedition's journey along the Yellowstone River in 1806. Visitors to the monument can explore the surrounding area, learn about the expedition's history, and marvel at the impressive geological formation that has stood the test of time.