he Amazing Race 18 is the eighteenth installment of the reality television show The Amazing Race. The Amazing Race 18 featured eleven teams of two – each returning from a previous edition for the first time since Season 11 – in a race around the world for a $1 million prize.
The eighteenth cycle started on Sunday, February 20, 2011. It aired on CBS in the United States on Sunday nights at 8:00 pm ET/PT with the two-hour season finale on May 8, 2011. The show is hosted by Phil Keoghan.
It is the first American season of The Amazing Race to be filmed and broadcast in high-definition.
Sisters LaKisha "Kisha" and Jennifer "Jen" Hoffman from Season 14 were the winners of The Amazing Race: Unfinished Business. Kisha is the first openly gay woman to win the competition.Overview from themoviedb.org