The beer is flowing and carnival rides running again at this year’s 179th Oktoberfest in Munich. Known as the world's largest beer festival, the event dates to 1810 when Crown Prince Ludwig was married to Princess Therese and the people of Munich were invited to attend the festivities. More than 6 million people are expected to attend this year’s festival, which runs until Oct. 7. A young man displays a beer mug in the Hofbraeuhaus tent after the opening of the famous Bavarian Oktoberfest beer festival in Munich, southern Germany, on Sept. 22. The world's largest beer festival, held from Sept. 22 to Oct. 7 will attract more than six million guests from around the world. Revelers toast after getting the first beer in the traditional one-litre "Masskrug" beer mugs at the opening day of the Munich Oktoberfest at the Theresienwiese. A traditional one-litre "Masskrug" beer mug is left behind on a beer garden table during heavy rain falls at the opening day of the Munich Oktoberfest.