The Mustangs Of Las Colinas: The largest equestrian sculpture in the world by sculptor Robert Glen is located in Williams Square, Irving,Texas. This magnificent larger than life sculpture was installed in 1984 as a memorial to the heritage of Texas. The mustangs are depicted racing through a flow of water in a granite stream. Mustangs were the escaped descendants of horses brought to America by the Spaniards. They roamed wild, northwest across Texas from Mexico.