Sentence:  At each of these stations there is a hostelry which they call a <WSD>"khan</WSD>", where travellers alight with their beasts, and outside each <WSD>"khan</WSD>" is a public watering-place and a shop at which the traveller may buy what he requires for himself and his beast. 
Meaning of the word marked with <WSD> tags:  A caravanserai; a resting-place for a travelling caravan.