Sochi, Russia
1908 and 1948
London will hold the 2012 Olympics im pretty sure.
There are currenty no plans to hold the Olympics in Germany. next year it will be in London, then the winter Olympics in Germany then Rio de janeiro. The Olympic comittee will decide from there on.
Follow the related link for a full list of Olympic Events that Spain are taking part in in the Summer 2012 Olympics in London.