LEXINGTON is Kentucky's second largest city and is located eighty miles east of Louisville. The bluegrass fields surrounding the city are filled with thorobreds and stud farms where Kentucky Derby entrants are raised and trained. Located north of the city is the Kentucky Horse Park, a working horse park where visitors can ride ponies, take escorted trail rides and carriage tours. Its museums exhibit the development of horses and the history of registered breeds. Inside the city, tour the Mary Todd Lincoln House, the girlhood home of President Abraham Lincoln's wife, Mary.