Exclusive Sneak Peek: 'Amazing Race' Finale

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CBS

It's down to the final four teams in this Sunday's Amazing Race season finale and we're giving you an exclusive preview of the action. The leg starts with a quirky Irish sport called bog snorkeling in Northern Ireland, where one team will be eliminated. Then, the final three teams will fight it out for $1 million on U.S. soil in Washington. D.C.

First up, Katie and Max look dismayed facing the bog snorkeling challenge.