sentences:  A piece of grape shot thought to be from either Spanish explorers or fur traders was found by Arthur Lakes on the mesa top in April 1895.The earliest recorded ascents of the mesa occurred during the Colorado Gold Rush in 1859.In 1906, father and son William H. and Clyde L. Ashworth built the original Castle Rock Resort, a cafe atop Castle Rock, where visitors were taken by burro up a trail on the north flank of Castle Rock.