The following information is courtesy of Wikipedia
Sebring International Raceway is a road course auto racing facility in the southeastern United States, located near Sebring, Florida.
Sebring Raceway is one of the oldest continuously operating race tracks in the U.S., its first race being run in 1950. Sebring is one of the classic race tracks in North American sports car racing, and plays host to the 12 Hours of Sebring.
The raceway occupies a portion of Sebring Regional Airport (an active airport for private and commercial traffic that was originally built as Hendricks Army Airfield, which was a World War II training base for the United States Army Air Forces).