Preview: The Amazing Race 20, Season Finale! - It's a Great Place to Become Millionaires AFTER TRAVELING FIVE CONTINENTS, 22 CITIES AND NEARLY 40,000 MILES, "THE AMAZING RACE" CONCLUDES IN A SPECIAL TWO-HOUR SEASON FINALE ON SUNDAY, MAY 6 "It's a Great Place to Become Millionaires" - Th…