The three remaining teams dash to the finish line hoping to claim the $1 million first-place prize. The final leg takes them through Hawaii and Alaska before ending near Las Vegas.

The three remaining teams dash to the finish line hoping to claim the $1 million first-place prize. The final leg takes them through Hawaii and Alaska before ending near Las Vegas.

The four remaining teams travel to Auckland, New Zealand, and rappel into the nearby Lost World caves.

Four teams travel from the Australian outback to New Zealand, where they take a wild river ride and bungee jump 450 feet.

The five remaining teams travel from Hong Kong to the Australian outback.

The five remaining teams travel from Hong Kong to the Australian outback.

The teams travel from Northern Thailand to Hong Kong, where they must control a 40-ton crane and consume an ancient Chinese remedy.

The teams endure a 15-hour train ride from Bangkok to Northern Thailand then drive into the mountains where they compete in a river-rafting race.

The teams fly from Namibia to Bangkok, Thailand.

The teams struggle to make the first charter flight from Cape Town, South Africa, to Namibia, and then travel more than 500 miles by truck along unmarked desert roads to reach the next pit stop.

Nine teams jet from the jungles of Brazil to Cape Town, South Africa, where a third pair is eliminated.

Ten teams begin the second leg of the race as they travel from Rio de Janeiro to Iguacu Falls near the Brazil-Argentina border.

Eleven two-member teams begin their worldwide race for $1 million in Las Vegas and learn of their first stop: Rio de Janeiro.