The location is the town square in Springfield, MO where the shootout took place.

Wild Bill Hickok – Davis Tutt shootout

The Wild Bill Hickok – Davis Tutt shootout was a gunfight which occurred on July 21, 1865 in the town square of Springfield, Missouri between Wild Bill Hickok, and cowboy, Davis Tutt. It is one of the few recorded instances in the Old West of a one-on-one pistol quick-draw duel in a public place, in the manner later made iconic by countless dime novels, radio operas, and Western films such as High Noon and Eastwood's Dollars Trilogy. The first story of the shootout was detailed in an article in Harper's Magazine in 1867, making Hickok a household name and folk hero.

• http://en.wikipedia.org/wiki/Wild Bill Hickok – Davis Tutt shootout