There are 30 Welsh athletes competing in the Olympics - more than at any previous Games - including hurdler Dai Green and footballers Ryan Giggs and Craig Bellamy. See ITV Wales for their official preview of the 'Magnificent 30' and see if you can name them.
Jamaican sprinter Usain Bolt may have broken three world records, but he trails behind some of nature's top athletes.
At the Olympic Park hopes of British success are high. But you don't have to think back too far to remember it wasn't always like this.
ITV News has been given exclusive behind-the-scenes access to the man behind the Olympic Games, Seb Coe.