Is the cheaper one of the all kind of transportation way, and is the best when you want to move around inside a country if the country is no so big, is better in smalls countries and also to get places that are a little insulate and the buses are to many times the only way to get one city, village or place. In general in Europe the buses are comfortable no so much slows because in general the roads are good, so is a good election if you want to go a insulate place.
About where you can find buses, you should check in each country, but the most famous international bus company in Europe is: Eurolines
My brother and I in one of the Eurolines buses traveling around Latvia. March 2007
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