In Rockcastle County, Bee Cliff rears its summit three hundred and fifty-five feet above the river; there are also a number of saltpeter caves where large quantities of saltpeter were manufactured during the War of 1812. The largest, called Great Saltpeter Cave, with its many rooms, some of which cover an area of several acres, with its subterranean river and weird grandeur, is a rival in all respects but size to the noted Mammoth Cave of Edmonson County. The Fall Cliffs, at some points three hundred feet in height, are unsurpassed in grandeur. Among the places of interest in Union County there is, standing upon level bottom land, a rock two feet thick, twenty feet wide, and fifty feet high which, on account of its spur resembling the horn of an anvil, is called Anvil Rock. In the same county a large flat rock, deeply indented with impressions of the human foot of various sizes as well as the distinct footprints of the dog is found. In Warren County, Wolf Sink, one hundred and fifty feet wide by three hundred feet long and in depth varying from twenty feet on the south side to one hundred and fifty feet on the north side, is an interesting place. The Cumberland River in its passage through Whitley County has a perpendicular fall of more than sixty feet, forming Cumberland Falls, a picturesque cascade, the roar of which can be heard sometimes for more than twelve miles both above and below the cataract. Behind the sheet of falling water one can pass nearly across the river bed. THE WORLD'S GREATEST NATURAL WONDER In Edmonson County, near Green River, was discovered in 1809, by a Mr. Hutchins, while in pursuit of a wounded bear, that matchless subterranean palace,--the Mammoth Cave. It consists, not of one chamber, but of many magnificent rooms, winding avenues, towering domes, bottomless pits, picturesque cataracts, mystic rivers, gloomy seas, and crystal lakes, on five different levels. Geologists agree that this immense cavern was carved out of the limestone ages ago, by both the mechanical and chemical action of the water. Viewing the huge columns that have been formed by depositing the almost infinitesimal amount of lime dissolved from the rock, one stands in awe at the thought of the great span of time required for this marvelous work. [Illustration: A view in the Mammoth Cave.] Here no ray of sunshine lights up the darkness; here no sound breaks the silence; here no seasons come and go; here no living creature--save the torpid bat, the sluggish lizard, the silent cricket, the shy rabbit-like rat, and eyeless fish--exists.