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The four remaining teams travel from Edinburgh, Scotland to Belfast, Northern Ireland, where one person from each team gets down and dirty at the Road Block as the pressure to make it to the last leg mounts. The final three teams then travel to Mount Vernon, Virginia. In Washington, D.C., a Secret Service agent prepares them for a photograph with President Barack Obama. The first team to reach the finish line wins the US$1 million prize.
- Writers: Elise Doganieri, Bertram van Munster, Evan Weinstein
- Stars: Phil Keoghan