Of all the marvels, however, of this ancient, picturesque, romantic, and necromantic city, none in modern times surpass the Cave of Hercules, if we may take the account of Don Pedro de Roxas for authentic. The entrance to this cave is within the church of San Gines, situated in nearly the highest part of the city. The portal is secured by massy doors, opening within the walls of the church, but which are kept rigorously closed. The cavern extends under the city and beneath the bed of the Tagus to the distance of three leagues beyond. It is, in some places, of rare architecture, built of small stones curiously wrought, and supported by columns and arches. In the year 1546 an account of this cavern was given to the archbishop and Cardinal Don Juan Martinez Siliceo, who, desirous of examining it, ordered the entrance to be cleaned. A number of persons, furnished with provisions, lanterns, and cords, then went in, and, having proceeded about half a league, came to a place where there was a kind of chapel or temple, having a table or altar, with several statues of bronze in niches or on pedestals. While they were regarding this mysterious scene of ancient worship or incantation, one of the statues fell, with a noise that echoed through the cavern, and smote the hearts of the adventurers with terror. Recovering from their alarm, they proceeded onward, but were soon again dismayed by a roaring and rushing sound that increased as they advanced. It was made by a furious and turbulent stream, the dark waters of which were too deep and broad and rapid to be crossed. By this time their hearts were so chilled with awe, and their thoughts so bewildered, that they could not seek any other passage by which they might advance; so they turned back and hastened out of the cave. It was nightfall when they sallied forth, and they were so much affected by the terror they had undergone, and by the cold and damp air of the cavern, to which they were the more sensible from its being in the summer, that all of them fell sick and several of them died. Whether the archbishop was encouraged to pursue his research and gratify his curiosity, the history does not mention. Alonzo Telles de Meneses, in his history of the world, records that not long before his time a boy of Toledo, being threatened with punishment by his master, fled and took refuge in this cave. Fancying his pursuer at his heels, he took no heed of the obscurity or coldness of the cave, but kept groping and blundering forward, until he came forth at three leagues’ distance from the city.