They call it the greatest show on Earth. With 11,000 athletes from 207 countries taking part in 306 events, the 2016 Rio Olympics did not disappoint in terms of size, delivering a mammoth festival of sport unrivalled by anything else on the planet. But with mammoth size comes mammoth challenge, namely the gigantic task of organising and running the show. Staging the greatest show on Earth demands one of the biggest logistical operations - and a truly global effort.