To compare with 100 years ago, we can go almost of everywhere that we want. Because of this, tourism has been made it big in modern society. Tourism is the commercial organization of holidays and services for tourists. For example, if you visit somwhere to tour then you will expect to see something special or get a service in there. This is the exact meaning of tourism.
Tourism can make a world of difference, especially for economic aspect. For instance, some countries which have a historical or special place can make a lot of money because of tourism. Some countries earn money only by selling their culture or history. In this case, we can think about advantage of tourism.
However, we have to keep up with environmental problems. Many touristic important places went wrong because of some thoughtless tourists. And the more serious problem is we can't restore them after we destroy them. We should let people know about some culture that have to be got rid off.
In Thailand, there are one village which is named "Padong long neck". In this village, women should put many rings on their neck. It will make your hair stand on end if you see them, even though it is kind of culture and they have made a practice of doing something since long time ago. This is not real culture but forced culture just because of money. This is one of bad influence of tourism.
It is true that tourism is one method to earn money. And for some countries, it is very important because they don't have any othre source to make money. Bur we sould care about the disadvantage of tourism. Every tourists must think about envrionment and the preciousness of historycal places. For using the advantage of tourism, we should be more mature and rational.