Circuit of the Americas is a 3.427-mile (5.515 km) motor racing circuit in Travis County, Texas, near Austin. It is due to hold the Formula One United States Grand Prix on November 18, 2012, the penultimate round of the 2012 season. The circuit will also host the Texas Motorcycle Grand Prix, a round of the Road Racing World Championship — commonly known as MotoGP — in addition to the Australian V8 Supercars series, the FIA World Endurance Championship, the American Le Mans Series, and the Rolex Sports Car Series, all of which will make their debuts at the circuit in 2013.
The circuit and Grand Prix were first proposed in the middle of 2010. The circuit will be the first in the United States to be purpose-built for Formula One. The layout was conceived by promoter Tavo Hellmund and 1993 Motorcycle World Champion Kevin Schwantz with the assistance of German architect and circuit designer Hermann Tilke, who has also designed the Sepang, Shanghai, Yas Marina, Istanbul, Bahrain, Yeongam, and Buddh circuits, as well as the reprofiling of the Hockenheimring and Fuji Speedway.
Source and more information: http://en.wikipedia.org/wiki/Circuit_of_the_Americas