Looking into OK Corral from the street. A major fire in 1882 destroyed everything in this area, so the picture is of what came after. The building on the left is where the original Flys Photo Studio stood, on the right was a house. The alley in between was the access to the OK Corral and a vacant lot behind that is where the famous gun fight occurred.

The above is what I had researched a few years ago, but didn't quite get it right. The following is also from John and corrects and further explains the scene.

Great photo! According to the Arizona Daily Star, however, the 1882 fire did not reach this far west as it raced down the south side of Fremont Street toward Third Street. The site on the left was Mollie Fly’s boarding house. The photograph studio was in a second building behind the boarding house. Eighteen feet west and across the alley from the boarding house was William A. Harwood’s House, belonging to Tombstone’s first mayor and seen here. The alley was where the shooting started, and, for the most part, continued. As it neared its conclusion, Tom McLaury put into Fremont Street in the vicinity of the photographer (Walker). Holliday, closer to the irrigation ditch that ran north and south (and seen here) fired his shotgun and killed the cowboy. Little but perhaps a stray shot, occurred to the south in the lot behind the alley and alongside of the OK Corral.