The Grand National
Held at Aintree in Liverpool and first run in 1839, the Grand National is the biggest steeplechase of the season, and is one of the toughest races for the horses.
Up to 40 horses are allowed to enter, and normally they don't all make it round the course, which is over four miles long.
The Cheltenham Festival
A three-day meeting that is known as the biggest in racing. Each day has one really big race - The Queen Mother Champion Chase, the Champion Hurdle and the Triumph Hurdle.
The biggest flat race in the world held at Epsom in Surrey, the Derby was first run in 1780.
Only three-year old horses are allowed to enter the race, which is run over a mile and four furlongs, and finishes with a gallop up the famous Epsom hill.
As well as the Derby, four other flat races are grouped together and are called the classics. They are the 1,000 Guineas, the 2,000 Guineas, The Oaks and the St Leger.