Some people call it the "Bluegrass State" because of a special kind of grass that grows there. There are also horses in Kentucky that eat this blue grass. Kentucky is very famous for its horse farms. The Kentucky Derby, a well-known horse race. It is held in the city of Louisville, which is also the largest city in the state. Other well-known places are Fort Knox, The Cumberland Gap, Cumberland Falls, Mammoth Cave, Red River gorge, and Land Between the Lakes.