The site has been explored a number of times, but the most comprehensive and conclusive work was done by the 1933 expedition that was headed by Dr. Garstang. The walls of Jericho were mighty, and as long as they stood the city was impregnable to the armed forces of antiquity. The unusual structure of Jericho’s walls was manifested when they were uncovered from the dirt and debris of centuries. The word “walls” is properly given in its plural form as there were outer and inner walls that entirely encircled the city. There was, first of all, surrounding the city completely, an outer wall, which seemed to have been held up as much by faith as by gravity! Ever since we had the first opportunity of personally examining the geology of Jericho and noting the insecure structure upon which those walls were builded, our own private wonder has not been that the walls fell down; rather we have been bewildered by speculating as to what in the name of physics ever held them up! Perhaps it was the binding of the buildings that anchored the outer wall to the inner wall, and made a sort of tripod structure of the whole, which accounted for this phenomenon. Some fourteen feet back from the outer wall and roughly paralleling the convolutions of the former, there was an inner wall of the same height as the outer one. Across these two walls great beams had been laid, and dwellings constructed upon this unique foundation. The outer wall was pierced by the one gate, in exact accordance with the description in the Book of Joshua. There is no natural explanation to account for the unique evidence of the collapse of these walls. They were not undermined by military engineers, for they all seem to have collapsed around the entire circumference of the city at one and the same time. They were not shaken down by an earthquake. This would have resulted in a haphazard piling of the wall material in a number of different directions. It seems as though a mighty blast had been set off in the center of the city, thrusting the walls outward, in what might roughly be described as a circle. This collapse of the walls naturally resulted in the wrecking of the houses builded thereon. When the preliminary clearance had been made and the excavators came down to these great ruins, every demand of the Book of Joshua was satisfactorily met by the conditions there uncovered. In the remnants of the houses found in Jericho there was overwhelming evidence of a systematic destruction by fires that were set to sweep the entire ruin. Among the most interesting and significant of the charred evidences were the great stores of burned grain which showed that even the food of Jericho had been dedicated to the fire, as Joshua had commanded.