Although it’s just the fifth largest city in Germany, Frankfurt (Frankfurt am Main) is the financial and transportation center of the country. Get now the cheapest student airline ticket and be ready to fly to the city which has one of the world’s best and busiest airports (Frankfurt International Airport). Located on the River Main, Frankfurt is the only city in Germany that is in the list of the ten Alpha world cities; so basically, it’s one of the richest cities, and it has a lot of things to offer to tourists.