One of the things I like in European airports is the airport is usually very well connected with the public transportation system. That makes the visit of the cities extremely easy for any visitor. Frankfurt Airport has its own train station right at the airport. One thing that should be noted is that actually there are two train stations in the airport. The train station right at the Terminal 1 is for S-Bahn and regional trains. There is another train station accessed also from the Terminal 1 which is for high speed ICE trains to other cities. The local train station is just like any other metro station and you can get tickets from the machine right next to the platform.