In preparation for my new contract, I visited Antietam Battlefield last week, staying at the very clean, lovely guest home, the Mary Hill House. We enjoyed listening to the very knowledgeable Bob Murphy of RCM History Tours (Twitter @RCMHistoryTours). His prices are very reasonable and he accommodated our desire to walk some of the tour.
This, I believe, was a picture of the "Cornfield." Hard to say without the corn. :) One of the most intense spots of the entire battle.