These ruins are part of Ha Ha Tonka State Park near Camdenton, Missouri.
Not really a castle but more of a mansion, this structure was built in 1904 by a wealthy St. Louisan. The owner did not live to see it completed. Over time it fell in disrepair and was eventually sold by his family. In 1942 the main structure and others around it were destroyed by fire.
This is a difficult photo to capture because directly behind me is the edge of a bluff with about a 150 foot drop. To get the photo, a tripod was used and then 5 pictures were taken of the left side of the building at different exposures and then 5 of the right. There is a special function in Lightroom that will combine all of the photos into one RAW file so it can then be edited in Aurora HDR.
Great Rivers Imaging 