Pompeys Pillar Is a Curious Geological Formation and a Famous Historical Landmark of the Lewis and Clark Expedition.
…This Is Along The ZMM Route Going West Southwest After Casper, MT. This famous Tourist Attraction is curiously unmentioned in ZMM, despite the Narrator's stated interest in Lewis and Clark. Also skipped over by Author Robert Pirsig, despite it's being clearly marked by signs and is visible to the West from along the older (non interstate) highway. ….Passed on by, just because it IS a “Tourist Attraction” !
…This is, of course, along the same pavement as the Narrator's 1968 trip.
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Excerpts From Wikipedia: …
…Pompeys Pillar National Monument is a rock formation located in south central Montana, United States. Designated a National Monument on January 17, 2001, and managed by the U.S. Bureau of Land Management in conjunction with The Friends of Pompeys Pillar, it consists of only 51 acres (21 ha), making it one of the smallest National Monuments in the U.S. The community of Pompeys Pillar lies just east of the monument.
…William Clark named the outcropping after Jean Baptiste Charbonneau—the son of expedition member Sacagawea—whom he nicknamed "Pompey". His original name for it was "Pompey's Tower"; it was changed to the current title in 1814.
….Situated 25 miles (40 km) northeast of Billings, Montana, along Interstate 94, the pillar gets 50,000 visitors annually. Archeological evidence suggests that the outcropping has been witness to 11,000 years of human involvement in the area. Consequently, in addition to the pictographs and the signature of William Clark, hundreds of other people have carved their initials into the rock, including early pioneers to the area.
Click Here => Wikipedia Has More Information, And 3 Good Photos, Which Includes A Picture Of Captain William Clark's Name Carved Into The Rock (July 25, 1806..

…The name Pompey comes from a famous Ancient Roman General =>
… Gnaeus Pompeius Magnus (Latin; 29 September 106 BC – 28 September 48 BC), known in English as Pompey /ˈpɒmpiː/ or Pompey the Great, was a leading Roman general and statesman. He played a significant role in the transformation of Rome from republic to empire.

…The name Pompey should not be confused with Pompeii (/pɒmˈpeɪ(i)/, Latin: [pɔmˈpei̯.iː]), an ancient city located near Naples in Italy.

…Click Here For ZMM Route Photos & Information In The Montana Area Of Pompeys Pillar.
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(Photo = 105 0563 ...... ZMM Page = 102 ...... WayPt = 115 2920ft)