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Where did Ancient Olympic Games take place? In Olympia, Greece. When was the first time the Olympic Games were  held? In  776 BC How long did the last? For five days. What nationalities were participating? Only Greeks.  Where did the First modern Olympic Games take place? In Athens,Greece. When did it happen? In 1896. How long did they last? 10 days. Home many different nationalities were participating? 14 different nationalities.  Where did the Olymoic Games of 2008 take place? In Beijing, China. When was it? In 2008. How many days did it last? 17 days. How many different nationalities were participating? 204 different nationalities .