At the 151st Kentucky Derby, a global spotlight will shine on equine athleticism. It’s the subject of a growing body of ...

Derby Day has thrown just about everything at Churchill Downs — from blazing heat to pounding rain, and even a little sleet (though those of us who were there will swear to you there were snowflakes).

Under a swath of Kentucky hills and hollows is a limestone labyrinth that became the heartland of a national park. The surface of Mammoth Cave National Park encompasses about 80 square miles.