Americans spend more money in Western Europe than in any other single area. For long-distance travel to become comfortable and attractive, the Industrial Revolution had to provide transport that was both safer and faster than the horse and carriage and the sailing vessel. This was accomplished by the rapid proliferation of railroads in Great Britain and Western Europe starting in the 1840s and by the advent of the steel-built, oceangoing steamship in the 1880s. With these two technological advances the great age of luxury travel dawned, a phenomenon in which rich Americans could also participate once passage across the Atlantic no longer posed a formidable obstacle. Tourism differs from travel as leisure differs from labor.
People travel for any number of reasons, from business to war or religion.
Tourism, however, is travel undertaken for pleasure. Depending on individual tastes, it may involve rest and relaxation, sports, cultural exchanges, educational and aesthetic experiences, or eating and shopping. As a modern multimillion-dollar business, it caters to the tourist's need for transportation, accommodation, food, entertainment, recreation, health, souvenirs, and social contact. Mass tourism is a relatively modern phenomenon, but travelers have reacted as tourists, regardless of the purpose of their journeys, since the beginning of recorded history. To write his history of the war between the Greeks and the Persians, Herodotus personally visited many of the areas making up the Persian Empire.