As the race intensifies and elimination looms, many of the teams overcome some bad luck and their fear of heights to get to the breathtaking site of Iguacu Falls.

Teams brave the deserts of Namibia and must journey more than 500 miles by truck through unmarked roads and the shifting sands to reach a distant pit stop. Meanwhile, conflict arises as one teams accuses another of cheating.

Teams fly more than 6,000 miles from the deserts of Namibia to the exotic streets of Bangkok, Thailand, where they encounter a puzzling maze of cultural challenges. En route, tensions between two teams reach a boiling point.

Teams must endure a 15-hour, third class train ride from Bangkok to Northern Thailand then drive into the mountains where they encounter elephants and engage in an intense river-rafting race that causes two teams to come to blows.

Seven teams race from the mountains of Northern Thailand to the bustling streets of Hong Kong where they face challenges ranging from controlling a 40-ton crane to consuming a 5,000-year-old Chinese remedy to avoid being eliminated.

Four teams race from the Australian Outback to the South Island of New Zealand where they confront a high-speed jet boat river ride, an unruly flock of sheep and a 450-foot bungee jump, one of the largest in the world

As they complete their journey around the world, the final three teams race to reach the finish line first and win the $1 million prize, on the special two-hour season finale.