Beer we go: Munich expects 6 million visits at this year's Oktoberfest

Waitresses Beli, right, and Anika pose with beer mugs during the opening of the 181th Oktoberfest beer festival in Munich, southern Germany, Saturday, Sept. 20, 2014. The world's largest beer festival will be held from Sept. 20 to Oct. 5, 2014. (AP Photo/Matthias Schrader) (The Associated Press)

People await the opening of the 181th Oktoberfest beer festival in Munich, southern Germany, Saturday, Sept. 20, 2014. The world's largest beer festival will be held from Sept. 22 to Oct. 5, 2014. (AP Photo/Matthias Schrader) (The Associated Press)

Waitresses await the opening of the 181th Oktoberfest beer festival in Munich, southern Germany, Saturday, Sept. 20, 2014. The world's largest beer festival is held from Sept. 20 to Oct. 5, 2014. (AP Photo/Matthias Schrader) (The Associated Press)

Four taps on the keg and the beer started to flow.

Munich mayor Dieter Reiter opened the city's annual Oktoberfest with the traditional call of "Ozapft is" to the delight of thousands who had managed to get a place in the main beer tent Saturday.

Some 6 million people are expected to visit what is billed as the world's biggest beer party that runs through Oct. 5.