The Discovery Handicap is an American Thoroughbred horse race held annually during the latter part of November at Aqueduct Racetrack in Queens, New York. A Grade III event open to three-year-old horses, it is contested on dirt over a distance of one and one eighth miles (nine furlongs).In its 71st running in 2015, the race honors the great Discovery, the 1935 American Horse of the Year owned and raced by Alfred G. Vanderbilt II. In the list of the top 100 U.S.