When Doctor Fewkes, in the early summer of 1915, attacked the mound which had been designated Community House under the supposition that it covered a ruined pueblo, he had no idea of the extraordinary nature of the find awaiting him, although he was prepared from its shape and other indications for something out of the usual. So wholly without parallel was the disclosure, however, that it was not till it was entirely uncovered that he ventured a public conjecture as to its significance. The ground-plan of Sun Temple is shaped like the letter D. It encloses another D-shaped structure occupying nearly two-thirds of its total area, within which are two large kivas. Between the outer and the inner D are passages and rooms, and at one end a third kiva is surrounded by rooms, one of which is circular. Sun Temple is also impressive in size. It is a hundred and twenty-one feet long and sixty-four feet wide. Its walls average four feet in thickness, and are double-faced, enclosing a central core of rubble; they are built of the neighborhood sandstone. The masonry is of fine quality. This, together with its symmetrical architectural design, its fine proportions, and its many decorated stones, mark it the highest type of Mesa Verde architecture. [Illustration: _From a photograph by George L. Beam_ SUN TEMPLE, MESA VERDE NATIONAL PARK Built by prehistoric people to their god, the sun, and unfinished when they suddenly disappeared] [Illustration: _From a photograph by George L. Beam_ SPRUCE TREE HOUSE FROM ACROSS THE CANYON Showing the overhanging rock roof and the forest which tops the Mesa Verde] It was plainly unfinished. Walls had risen in some places higher than in others. As yet there was no roofing. No rooms had been plastered. Of internal finishing little was completed, and of contents, of course, there was none. The stone hammers and other utensils of the builders were found lying about as if thrown down at day's close. The kivas, although circular, are unlike those of Cliff Palace, inasmuch as they are above ground, not subterranean. The mortar used in pointing shows the impress of human hands; no trowels were used. The walls exhibit many stones incised with complicated designs, largely geometric; some may be mason's marks; others are decorative or symbolic. These designs indicate a marked advance over those in Far View House; in fact they are far more complicated and artistic than any in the southwest. Bare and ineloquent though its unfinished condition left it, the religious purposes of the entire building are clear to the archaeologist in its form. And, as if to make conjecture certainty, a shrine was uncovered on the corner-stone of the outer wall which frames in solid stone walls a large fossil palm-leaf whose rays strongly suggest the sun!