Christian County contains also some sinking streams, forks of Little River, beside Pilot Rock, which rests upon elevated ground, has a comparatively level summit, covers about one half acre of ground, and is about two hundred feet high. This county also contains a natural bridge, which crosses a deep ravine with an artistic arch of sixty feet, and is thirty feet in height. Picturesque falls, ninety feet high, are found in Clinton County, while "Rock House," forty feet high and about sixty feet square, is located in Cumberland. In Edmonson County, besides the wonderful Mammoth Cave, there is "Dismal Rock," almost perpendicular and one hundred and sixty-three feet high. In Grant County, for many years an object of great curiosity, was an immense poplar tree, nine feet in diameter; it is said a man on horseback, after it lay prostrate, could barely touch the top of the trunk with the tips of his fingers. A natural fortification, a circular tableland, from fifty to one hundred and twenty-five feet high, impossible of ascent except in one place, is an object of great interest in Hancock County. In Jessamine County, amid awful grandeur and gloom, the Devil's Pulpit is found, with a total elevation of three hundred feet. In Lincoln County the Knobs, some with a base one hundred and fifty yards in diameter, two hundred feet high, and entirely destitute of vegetation, attract great attention. Mantel Rock, or Natural Bridge, in Livingston County, in picturesqueness rivals the far-famed Natural Bridge of Virginia. This rock, resting against the hillside, is eight and three fourths feet thick and twenty feet wide; its arch spans two hundred and twenty feet. One of the paintings that attracted most attention in the Kentucky building at the St. Louis World's Fair was the artistic reproduction of this picturesque place by Mrs. Georgia McGrew Edwards. In Lyon County, near Eddyville, 1848, several men explored a cavern for half a mile, where a large stream of water, an underground river, was found to be flowing. About three miles from Benton, in Marshall County, on a high hill, there is a lake about sixty yards in diameter, whose depth is unknown; its waters neither rise nor fall, but stand about fifty feet above the bed of the creek below. In Meade County, between Salt River and Sinking Creek, are several knobs and groves that the pioneers used as points of observation from which to detect the movements of the Indian parties just after they crossed to the south side of the Ohio River. Bardstown, in Nelson County, is built on an elevation under which is a natural tunnel, several feet in diameter, of circular form, reaching from the eastern to the western extremity of the eminence. Owen County has several objects of interest, among them being Point of Rocks, about seventy-five feet high, overhanging Deep Hole, whose depth has never been ascertained.