Which city hosted Bolt's three gold medals at the 2009 World Championships? Berlin hosted them. The championships took place at Berlin's Olympiastadion from 15 to 23 August 2009.
Bolt won the 100 metres in a world-record 9.58 seconds, defeating Tyson Gay. He then won the 200 metres in another world record, 19.19 seconds. His third gold came in Jamaica's 4 × 100 metres relay, completed in 37.31 seconds.
Berlin was especially resonant in athletics history because the Olympiastadion was also where Jesse Owens won four gold medals at the 1936 Olympics. Bolt's performances created a modern parallel: both sprinters became the defining stars of major championships held at the same venue, although their events and historical circumstances were very different.
A common mix-up is Daegu, which hosted the 2011 World Championships, and Moscow, host of the 2013 edition. Bolt also won three gold medals in Moscow, but his 2009 triple belongs to Berlin.