"A year ago my family was at the Alamo. We were just taking pictures to see if we would catch anything. After we uploaded the photos, we found something. See what you think. Look at the wall by the tree. When this is zoomed, in you can make out a white shirt and a face of a man. it almost looks like his right hand is on a rifle strap." - Doug
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Close-up
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Comparison Photo
Conclusion:
We do not believe this was a staged photo or that it was even possible to stage given the historic site. The original picture was tested and did not come back as being photo-edited. The image within the tree does look like a human form wearing a white shirt.
Is it a ghost? You decide...