Landmarks.—Webster defines a landmark as a mark to designate the boundary of land, or "any conspicuous object on land that marks a locality or serves as a guide." The latter part of the definition is especially true of cliffs, tall trees, etc., along the seacoast or the banks of navigable rivers, by which the pilots of vessels steer their course. Landmarks may be divided into natural and artificial, the former being those natural formations that "serve as guides," and the latter the works of man that have a historic interest. Among the natural landmarks of Kansas the most prominent are Pawnee rock, Diamond and Great Spirit springs, Mushroom and Castle rocks, the formation known as Rock City, and the natural bridge near Medicine Lodge. Each of these will be found under the appropriate title in this work. Of the artificial landmarks the best examples are the markers along the Santa Fe trail, Pike's Pawnee village, the old Pottawatomie mission, the Padilla monument near Council Grove, and the ruins of the old pueblo in Scott county. The old wind-mill at Lawrence was for many years a landmark, and the ruins of the old capitol near Fort Riley might be so considered.