Internationally connected – and connecting
Frankfurt is a truly international city. Its citizens, few by comparison with other European capitals, represent more than 170 nationalities, making it one of Germany's most international cities. Its airport serves more global destinations than any other in the world, and it's home to DE-CIX, the largest Internet Exchange Point on the planet, with data transferring at over 2.5 terabit per second. Often thought of as a financial centre, Frankfurt is also one of Europe's green capitals. A healthy place with a high standard of living. And in the New York Times list of 52 places to be in 2014, Frankfurt is № 12. (We're not sure whether this is also because of CSF2014, but unless proven otherwise, we like to think it is so).
A rich history and much to see and learn
Since medieval times Frankfurt has played a prominent role in the German history. You can get a very good overview of the city's past and present in the English Wikipedia.
And if you like to spent some more days in Frankfurt, you might like to hear, that with your conference pass comes the Congress+Museum ticket, which gives you free admission to 34 museums and cultural institutions.