We may now either go through the Himmels Thor to the left, or keeping straight up under the old trees and passing the "Mount of Olives" on the left, approach the large deep-roofed building between two towers. This is the Kaiserstallung, as it is called, the Imperial stables, built originally for a granary. The towers are the Luginsland (Look in the land) on the east, and the Fünfeckiger Thurm, the Five-cornered tower, at the west end (on the left hand as we thus face it). The Luginsland was built by the townspeople in the hard winter of 1377. The mortar for building it, tradition says, had to be mixed with salt, so that it might be kept soft and be worked in spite of the severe cold. The chronicles state that one could see right into the Burggraf's Castle from this tower, and the town was therefore kept informed of any threatening movements on his part. To some extent that was very likely the object in view when the tower was built, but chiefly it must have been intended, as its name indicates, to afford a far look-out into the surrounding country. The granary or Kaiserstallung, as it was called later, was erected in 1494, and is referred to by Hans Behaim as lying between the Five-cornered and the Luginsland Towers. Inside the former there is a museum of curiosities (Hans Sachs' harp) and the famous collection of instruments of torture and the Maiden (Eiserne Jungfrau). The open space adjoining it commands a splendid view to the north. There, too, on the parapet-wall, may be seen the hoof-marks of the horse of the robber-king, Ekkelein von Gailingen. Here for a moment let us pause, consider our position, and endeavor to make out from the conflicting theories of the archeologists something of the original arrangement of the castles and of the significance of the buildings and towers that yet remain. Stretching to the east of the rock on which the Castle stands is a wide plain, now the scene of busy industrial enterprise, but in old days no doubt a mere district of swamp and forest. Westward the rock rises by three shelves to the summit. The entrance to the Castle, it is surmised, was originally on the east side, at the foot of the lower plateau and through a tower which no longer exists.