Some of the most creative aircraft invade Victoria Harbor in Hong Kong. From Tim Burton-inspired flying saucers to exploding volcanoes, there's an eclectic variety of homemade flying machines to see.
The normally tranquil streets of East Melbourne transform into a festival of gravity racing; 56 teams take on a ferocious course littered with obstacles.
Fearless Norwegian soapbox racers conquer Torshovdalen Park in Oslo; they try to master a treacherous water feature, a challenging berm, and a startlingly steep finish.