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By the time that 400 BC, the Roman empire had expanded into an entire nation of its own. They had built over 80,000 km of road in Europe making it easier to travel and venture out to different places. They also built taverns, restaurants, and various entertainment spots for tourists.
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Travelling became easier due to the quick advancements in society. People were actually encouraged to travel, to see the beautiful cities around.
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During the early civilization times many people would only travel for their own gain. No one was truly travelling to have fun it was typically done by foot over long day spans. It was done often due to possible trades.
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Many kingdoms were spread apart so, merchants had to travel a somewhat greater distance. This was also referred to as the dark ages, the thought of venturing out made so many people excited and curious. It caused people to the interested in seeing so many new things.
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England's nobility began sending their sons to different countries and places for education. They were also taught important skills to be able to take over their dads' estate when they passed. Yet, these trips lasted several years in order to get them all the experience you needed.
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During the industrial revolution a middle class was able to emerge due to the industrial revolution. The new economy allowed people to travel as freely as they wanted to. One of the big changes in this era was the creation of the car and steam engine.
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The outbreak of war made travel dangerous all over again. People rarely traveled for their own pleasure due to the outbreak of war. Even with the ware going on many things became more comfortable for travel.
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Tourism grew all over again, transportation systems became safer and more comfortable.
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These previous advancements made tourism what it is today. Tourism is at an all time high and many people do it often. Yet, events like 9/11 made travelling a bit more restricted than before.