Captain Wm. Clark of the Lewis and Clark Expedition stopped here on July 25, 1806, while traveling down the Yellowstone. In his journal he wrote that the rock, which he named Pompey’s Tower, was 200 feet high and 400 paces in circumference and accessible only on one side. He recorded that Native people had engraved figures of animals on the face of the rock, near which he marked his name and the day of the month and year. His signature still remains there. The party camped a few miles down the Yellowstone that night, and the buffalo made so much noise that they had difficulty sleeping.