Usain Bolt celebrates his 200m gold moments before a cameraman on a Segway knocked him over at the Beijing National Stadium, also known as the Bird's Nest, on August 27, 2015.
The sun shines inside the Bird's Nest before the opening session on Day One of the World Athletics Championships.
The Ai Weiwei-designed Bird's Nest was built for the 2008 Olympics.
The view Usain Bolt had from lane five when he sprinted to 100m gold.
A sideways glance at the Bird's Nest amid unusually blue skies for Beijing. Factories around the capital have been shuttered ahead of a major military parade.
Opening ceremonies are as colorful as they are surreal.
Usain Bolt pictured celebrating one-third of his triple gold. Watch out for that Segway ...
A sign for athletics lovers at the stadium.
The track is set up inside the Bird's Nest for one of the most spectacular events -- the sprint hurdles.