The Incas Bridge (natural formation), Pass of Uspallata, South America, 1868. Engraving of a sketch by Mr. D. Powell. At Mendoza mules are to be obtained to cross the Cordillera, and a troop of about double the number actually required is generally taken, with a bell-mare to lead the way. There is but little pasture to be obtained while crossing the Cordillera, and all the provisions required must be carried. The first two days are occupied in passing a low, subordinate ridge; and then the course of the river Mendoza is followed for two days, to the foot of the highest part or col of the pass, which is over 12,000 ft. high. [The view]...represents a natural bridge, which here spans the river. From every part of it hot water bubbles out, and the most beautiful stalactites are formed; the whole bridge and bank being covered with brilliant yellow and green incrustations. It is one of the most interesting features in the pass of Uspallata. The descent on the Chilian side of the Cordillera is much steeper, and is, consequently, accomplished in a shorter time than the ascent. From "Illustrated London News", 1868.