The picture below was taken by Margaret on the Ghost Tour on June 19, 2005. 

The picture is amazing.  It was taken through the window of the Artificer's Shop.  On the Ghost Tour the following week, Margaret took four more pictures through the same window, in the same light conditions, to make sure that the figure that appeared in the window was not her reflection.  In those four pictures, not a hint of her reflection showed up, thus confirming that the figure in this picture is not her reflection.
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The pictures below are stills taken from a video which Wendy recorded on the Ghost Tour on June 19, 2005.  The video at different times showed anywhere from one to four figures in the circled area, sometimes fighting.  It also at times showed figures along the side of the building.  Due to the distance from the area, and the shadowy figures involved, the video is too dark to see properly.  These pictures have been contrasted to show the figures better.  They are the only pictures clear enough to post.

The first picture shows a woman with long hair in the circle to the left.  The other circle shows a soldier.
The second picture also shows the same woman in the circle to the left.  The other circle shows what may be a horse, although it's harder to make out.
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This picture shows 3 or 4 figures.  Click on the picture to see a bigger version.