As the world’s attention turns to Paris, the French capital is under its strongest-ever security regime ahead of the Olympics.

Today’s Olympics are vastly different to those that began in ancient Greece. So what was it like attending those ancient games?

AI is finding applications across sport, from talent spotting and training to gymnastics judging and injury rehab.

Most Olympic stadiums, venues and structures continue to be used long after the games finish. But how are they used and what happened to the venues that have fallen into disuse?