Further up the Yellowstone, on the same side, are a number of wonderful ravines and cañons carved in like manner into the very heart of the mountains. Most conspicuous of these is the Cañon of Tower Greek. Before reaching that stream, however, Column Rock, a noticeable feature in a landscape of great extent and beauty, demands at least a passing notice. Column Cliff would be a more appropriate name, since it extends along the east bank of the river upwards of two miles. Says Mr. Langford, whose observations were made from the west side: "At the distance from which we saw it, we could compare it in appearance to nothing but a section of the Giant's Causeway. It was composed of successive pillars of basalt overlying and underlying a thick stratum of cement and gravel resembling pudding-stone. In both rows, the pillars, standing in close proximity, were each about thirty feet high and from three to five feet in diameter. This interesting object, more from the novelty of its formation and its beautiful surroundings of mountain and river scenery than anything grand or impressive in its appearance, excited our attention, until the gathering shades of evening reminded us of the necessity of selecting a suitable camp." Tower Creek rises in the high divide between the valleys of the Missouri and the Yellowstone, and flows for about ten miles through a cañon so deep and gloomy that it has earned the appellation, "Devil's Den." About two hundred yards above its entrance into the Yellowstone, the stream pours over an abrupt descent of one hundred and fifty-six feet, forming one of the most beautiful falls to be found in any country. These falls are about 260 feet above the level of the Yellowstone at the junction, and are surrounded with columns of volcanic breccia, rising fifty feet above the falls and extending down to the foot, standing like gloomy sentinels, or like gigantic pillars at the entrance of some grand temple. "One could almost imagine," says Dr. Hayden, "that the idea of the Gothic style of architecture had been caught from such carvings of nature." Speaking of the symmetry of some of these columns, Mr. Langford says: "Some resemble towers, others the spires of churches, and others still shoot up as lithe and slender as the minarets of a mosque. Some of the loftiest of these formations, standing like sentinels upon the very brink of the fall, are accessible to an expert and adventurous climber. The position attained on one of their narrow summits, amid the uproar of waters and at a height of 250 feet above the boiling chasm, as the writer can affirm, requires a steady head and strong nerves; yet the view which rewards the temerity of the exploit is full of compensations. Below the fall the stream descends in numerous rapids, with frightful velocity, through a gloomy gorge, to its union with the Yellowstone. Its bed is filled with enormous boulders, against which the rushing waters break with great fury.