We begin in Brazil, where thousands of athletes from all over the world gather for the 2016 Rio Olympics Opening Ceremony.

Held at the famed Maracana stadium, the celebration also drew Brazilian stars, like supermodel Gisele Bundchen, who walked across the stadium to the sound of bossa nova hit "Girl from Ipanema".

Following tradition, the ceremony also introduced each country that will be competing in the Games. The Chinese delegation includes 35 returning Olympic champions. Brazil also used the time to call for more attention to climate change and the deforestation of the Amazon.

Each athlete will be asked to plant seeds that will eventually grow into trees and be planted in the Athletes Forest in Rio in a few years.