Tourists make their way up the stairs to William Clark's signature at Pompeys Pillar along the Lewis and Clark Trail in southeastern Montana in 2014. The U.S. Bureau of Land Management is proposing work to keep the historic sandstone landmark near the Yellowstone River east of Billings from falling apart or eroding further. The sandstone is also engraved with over 5,000 other etchings, petroglyphs and pictographs, according to the National Park Service. (Larry Mayer/The Billings Gazette via AP)
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