The impression left upon the mind of a foreigner, on seeing this monument of human toil and unremunerative outlay, is respect for a people that could in any manner build it. Standing on the peak at _Ku-peh Kau_ (Old North Gate), one sees the cloud-capped towers extending away over the declivities in single files both east and west, until dwarfed by miles and miles of skyward perspective as they dwindle into minute piles, yet stand with solemn stillness where they were stationed twenty centuries ago, as though condemned to wait the march of time till their builders returned. The crumbling dike at their feet may be followed, winding, leaping across gorges, defiles, and steeps, now buried in some chasm, now scaling the cliffs and slopes, in very exuberance of power and wantonness, as it vanishes in a thin, shadowy line, at the horizon. Once seen, the Great Wall of China can never be forgotten. At present this remarkable structure is simply a geographical boundary, and except at the Gates nothing is done to keep it in repair. Beyond the Yellow River to its western extremity, the Great Wall, according to Gerbillon, is mostly a mound of earth or gravel, about fifteen feet in height, with only occasional towers of brick, or gateways made of stone. At Kalgan portions of it are made of porphyry and other stones piled up in a pyramidal form between the brick towers, difficult to cross but easy enough to pull down. The appearance of this rampart at Ku-peh kau is more imposing; the entire extent of the main and cross walls in sight from one of the towers there is over twenty miles. In one place it runs over a peak 5,225 feet high, where it is so steep as to make one wonder as much at the labor of erecting it on such a cliff as on the folly of supposing it could be of any use there as a defence. The wall is most visited at Nan-kau (South Gate), in the Ku-yung Pass, a remarkable Thermopyla fifteen miles in length, which leads from the Plain at Peking up to the first terrace above it, and at one time was guarded by five additional walls and gates, now all in ruins. From this spot, the wall reaches across Shansí, and was built at a later period. ~THE GRAND CANAL.~