Gallows

[barryssentials]

Hi there. The photo you took faces south. The gallows faced west (to the right) and was located in the northeast corner of the tennis court enclosure just off of court #4 (the mullion of the window covers the spot). It was off the playing surface but still on the green tennis court surface. The stairs would have come down from the gallows platform descending to the left and beyond the fence line. Mary Surratt would have been closest to you. The window you took this photo from can be seen in some of Alexander Gardner's images of the executions. FYI: The red brick building seen in the upper left corner of your picture is called Building 21. It is also known as the Model Arsenal and was the location where the last of the execution photos were taken.
I hope this helps.
Best
Barry Cauchon