Revelers Celebrate at the Opening Ceremony of the 2016 Olympic Games

A man poses for a picture wearing Olympic rings glasses and kissing a medal before entering the Maracana Stadium ahead of the opening ceremony for the 2016 Summer Olympics in Rio de Janeiro, Brazil, Aug. 5, 2016. (AP Photo/Natacha Pisarenko)

German fans have their photo taken before the opening ceremony. (Reuters/Mike Blake)

Fans from Japan and the United States walk toward the Maracana Stadium ahead of the opening ceremony for the 2016 Summer Olympics in Rio de Janeiro, Brazil, Aug. 5, 2016. (AP/Natacha Pisarenko)

A fan from the United States smiles as she walks toward the Maracana Stadium ahead of the opening ceremony for the 2016 Summer Olympics in Rio de Janeiro, Brazil, Aug. 5, 2016. (AP/Natacha Pisarenko)

A fan from Japan poses for a picture as he lines up to enter the Maracana Stadium ahead of the opening ceremony for the 2016 Summer Olympics in Rio de Janeiro, Brazil, Aug. 5, 2016. (AP Photo/Natacha Pisarenko)

2016 Rio Olympics - Opening Ceremony - Maracana - Rio de Janeiro, Brazil - 05/08/2016. A Colombian performs tricks witha ball outside Maracana ahead of the opening ceremony. (Reuters/Nacho Doce)

2016 Rio Olympics - Opening Ceremony - Maracana - Rio de Janeiro, Brazil - 05/08/2016. Chinese and Brazilian fans before the opening ceremony. (Reuters/Kai Pfaffenbach)

Des tambourineurs brésiliens accompagnent la délégation d’athlètes de chaque pays lors du défilé à l'ouverture des Jeux Olympiques au Stade Maracaña, 5 août 2016.

The festive atmosphere at the Maracana stadium Friday, August 5th at the opening ceremony of the Rio 2016 Olympic Games. Delegations from 206 countries taking part in various competitions of the games, including refugees, marched in front of 37 heads of state. The history of Brazil, host of the games, was told to the world through choreography and lights with a special focus on the global warming challenge facing the planet.