The Kentucky Derby is a beloved event that thousands attend in their best dress every year. It is the first of the races making up the Triple Crown. The Preakness Stakes and Belmont Stakes follow.
Millions also watch from home, with many putting money on the line by placing their bets.
The Kentucky Derby has produced many long-lasting traditions, from tasty mint juleps to extravagant hats.
KENTUCKY DERBY: HOW TO BET ON HORSES FROM HOME
Read more on the history of the Kentucky Derby.