Berlin is among the top three convention cities in the world and is home to Europe's biggest convention center in the form of the Internationales Congress Centrum (ICC). It contributes to the rapidly increasing tourism sector encompassing more than 700 hotels offering more than 100,000 beds. The city numbered 18.9 million overnight hotel stays, 8,3 million hotel guests and estimated 135 million daily visitors in 2009. Berlin has established itself as the third most-visited city destination in the European Union.