The modern traveler has little conception of the hardships and expense that were involved in the journeys of ages past. Surrounded by comfort, his every whim catered to by a global tourism industry, he is blissfully unaware of the suffering and danger necessarily involved in travel to remote regions of the globe before the modern consumer age. His chief preoccupations are the adjustment of his body to new time zones, the temperature of his air-conditioning, and the quality of his accommodations. Perhaps it is well that this is so: for nothing so unbalances the complacent mind than the realization that its perspective is based on narrow, parochial experience. Knowledge can both liberate and destroy.