Date: October 2, 2009
Event: 121st IOC Session
Location: Copenhagen, Denmark
On this evening Rio de Janeiro was announced as the host city of the Games of the XXXI Olympiad by IOC President Jacques Rogge. 6 Years, 10 months and 4 days later the Rio Olympics are about to start!
Rio 2016 bid video
https://www.youtube.com/watch?v=qyGW8TG2YWs